HTML如何禁止文本框输入
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两种方法：1、<input type="text" name="noedit" size="20" disabled="disabled" value="不可编辑">，这种方法可以让文本框不可编辑，但同时会导致服务端不能获取该文本框的值。2、<input type="text" name="noedit" size="20" readonly="readonly" value="不可输入">，这种方法可让文本框不可输入，但服务端可以获取该文本框的值。是什么需求就怎么用吧。 参考技术A禁止文本框输入有以下两种方法：
设置input为只读状态，代码如下：
<input readonly="readonly" value="test1"/>
2.设置input为不用状态，代码如下：
<input disabled="disabled" value="test2"/>
html文本域两种样式：
没有滚动条的文本域（无边框）；
<textarea style="border: 0; overflow: auto; color: #FFFFFF; background-image: url(http://expert.csdn.net/images/csdn.gif)"></textarea>
2.红色边框的文本域；
<textarea style="border: #FF0000 1px solid; overflow: visible; color: #FFFFFF; background-image: url(http://expert.csdn.net/images/csdn.gif)"></textarea>
参考资料
html中的input文本框禁止输入问题.CSDN[引用时间2018-1-5]
参考技术B <!--三种方案都可以！--><input type="text" name="自定义" readonly="readonly" />
<input type="text" name="自定义" disabled="disabled" />
<input type="text" name="自定义" autocomplete="off" id="number"/> 参考技术C 文本框里设置readonly属性 readonly="readonly" 参考技术D <input type="text" name="T1" size="20" readonly value="11">
如何定义文本框输入限制？
【中文标题】如何定义文本框输入限制？【英文标题】：How to define TextBox input restrictions? 【发布时间】：2010-11-09 09:06:49 【问题描述】：如何限制 TextBox 只接受大写字母，例如数字，或禁止输入任何特殊字符？
当然，在此处捕获 TextInput 事件并处理文本是小菜一碟，但这样做是否正确？
【问题讨论】：
【参考方案1】：我过去曾通过附加行为完成此操作，可以这样使用：
<TextBox b:Masking.Mask="^\pLu*$"/>
附加的行为代码如下所示：
/// <summary>
/// Provides masking behavior for any <see cref="TextBox"/>.
/// </summary>
public static class Masking
private static readonly DependencyPropertyKey _maskExpressionPropertyKey = DependencyProperty.RegisterAttachedReadOnly("MaskExpression",
typeof(Regex),
typeof(Masking),
new FrameworkPropertyMetadata());
/// <summary>
/// Identifies the <see cref="Mask"/> dependency property.
/// </summary>
public static readonly DependencyProperty MaskProperty = DependencyProperty.RegisterAttached("Mask",
typeof(string),
typeof(Masking),
new FrameworkPropertyMetadata(OnMaskChanged));
/// <summary>
/// Identifies the <see cref="MaskExpression"/> dependency property.
/// </summary>
public static readonly DependencyProperty MaskExpressionProperty = _maskExpressionPropertyKey.DependencyProperty;
/// <summary>
/// Gets the mask for a given <see cref="TextBox"/>.
/// </summary>
/// <param name="textBox">
/// The <see cref="TextBox"/> whose mask is to be retrieved.
/// </param>
/// <returns>
/// The mask, or <see langword="null"/> if no mask has been set.
/// </returns>
public static string GetMask(TextBox textBox)
if (textBox == null)
throw new ArgumentNullException("textBox");
return textBox.GetValue(MaskProperty) as string;
/// <summary>
/// Sets the mask for a given <see cref="TextBox"/>.
/// </summary>
/// <param name="textBox">
/// The <see cref="TextBox"/> whose mask is to be set.
/// </param>
/// <param name="mask">
/// The mask to set, or <see langword="null"/> to remove any existing mask from <paramref name="textBox"/>.
/// </param>
public static void SetMask(TextBox textBox, string mask)
if (textBox == null)
throw new ArgumentNullException("textBox");
textBox.SetValue(MaskProperty, mask);
/// <summary>
/// Gets the mask expression for the <see cref="TextBox"/>.
/// </summary>
/// <remarks>
/// This method can be used to retrieve the actual <see cref="Regex"/> instance created as a result of setting the mask on a <see cref="TextBox"/>.
/// </remarks>
/// <param name="textBox">
/// The <see cref="TextBox"/> whose mask expression is to be retrieved.
/// </param>
/// <returns>
/// The mask expression as an instance of <see cref="Regex"/>, or <see langword="null"/> if no mask has been applied to <paramref name="textBox"/>.
/// </returns>
public static Regex GetMaskExpression(TextBox textBox)
if (textBox == null)
throw new ArgumentNullException("textBox");
return textBox.GetValue(MaskExpressionProperty) as Regex;
private static void SetMaskExpression(TextBox textBox, Regex regex)
textBox.SetValue(_maskExpressionPropertyKey, regex);
private static void OnMaskChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e)
var textBox = dependencyObject as TextBox;
var mask = e.NewValue as string;
textBox.PreviewTextInput -= textBox_PreviewTextInput;
textBox.PreviewKeyDown -= textBox_PreviewKeyDown;
DataObject.RemovePastingHandler(textBox, Pasting);
if (mask == null)
textBox.ClearValue(MaskProperty);
textBox.ClearValue(MaskExpressionProperty);
else
textBox.SetValue(MaskProperty, mask);
SetMaskExpression(textBox, new Regex(mask, RegexOptions.Compiled | RegexOptions.IgnorePatternWhitespace));
textBox.PreviewTextInput += textBox_PreviewTextInput;
textBox.PreviewKeyDown += textBox_PreviewKeyDown;
DataObject.AddPastingHandler(textBox, Pasting);
private static void textBox_PreviewTextInput(object sender, TextCompositionEventArgs e)
var textBox = sender as TextBox;
var maskExpression = GetMaskExpression(textBox);
if (maskExpression == null)
return;
var proposedText = GetProposedText(textBox, e.Text);
if (!maskExpression.IsMatch(proposedText))
e.Handled = true;
private static void textBox_PreviewKeyDown(object sender, KeyEventArgs e)
var textBox = sender as TextBox;
var maskExpression = GetMaskExpression(textBox);
if (maskExpression == null)
return;
//pressing space doesn't raise PreviewTextInput - no idea why, but we need to handle
//explicitly here
if (e.Key == Key.Space)
var proposedText = GetProposedText(textBox, " ");
if (!maskExpression.IsMatch(proposedText))
e.Handled = true;
private static void Pasting(object sender, DataObjectPastingEventArgs e)
var textBox = sender as TextBox;
var maskExpression = GetMaskExpression(textBox);
if (maskExpression == null)
return;
if (e.DataObject.GetDataPresent(typeof(string)))
var pastedText = e.DataObject.GetData(typeof(string)) as string;
var proposedText = GetProposedText(textBox, pastedText);
if (!maskExpression.IsMatch(proposedText))
e.CancelCommand();
else
e.CancelCommand();
private static string GetProposedText(TextBox textBox, string newText)
var text = textBox.Text;
if (textBox.SelectionStart != -1)
text = text.Remove(textBox.SelectionStart, textBox.SelectionLength);
text = text.Insert(textBox.CaretIndex, newText);
return text;
【讨论】：
我不会这么说的。我确实写它比你需要的灵活得多。随意采用这个概念并根据您的需要进行简化。 非常好，肯特。一种灵活而强大的解决方案，用于限制 TextBox 中的条目。 +1 优雅！希望我能给超过+1 @Agzam，唯一困难的部分是学习 RegEx 而不会感到眼球疼痛......以及复制和粘贴...... @Andres:Masking.SetMask(textBox, "^pLu*$");【参考方案2】：
我还改进了 Kent Boogaart 的回答，还处理了以前可能导致违反模式的以下操作：
退格键 以可能违反模式的方式选择和拖动文本 剪切命令例如，Kent Boogaart 的回答允许用户输入“ac”，首先输入“abc”，然后用退格键删除“b”，这违反了以下正则表达式
^(a|ab|abc)$
用法（不变）：
<TextBox b:Masking.Mask="^\pLu*$"/>
面具类：
public static class Masking
private static readonly DependencyPropertyKey _maskExpressionPropertyKey = DependencyProperty.RegisterAttachedReadOnly("MaskExpression",
typeof(Regex),
typeof(Masking),
new FrameworkPropertyMetadata());
/// <summary>
/// Identifies the <see cref="Mask"/> dependency property.
/// </summary>
public static readonly DependencyProperty MaskProperty = DependencyProperty.RegisterAttached("Mask",
typeof(string),
typeof(Masking),
new FrameworkPropertyMetadata(OnMaskChanged));
/// <summary>
/// Identifies the <see cref="MaskExpression"/> dependency property.
/// </summary>
public static readonly DependencyProperty MaskExpressionProperty = _maskExpressionPropertyKey.DependencyProperty;
/// <summary>
/// Gets the mask for a given <see cref="TextBox"/>.
/// </summary>
/// <param name="textBox">
/// The <see cref="TextBox"/> whose mask is to be retrieved.
/// </param>
/// <returns>
/// The mask, or <see langword="null"/> if no mask has been set.
/// </returns>
public static string GetMask(TextBox textBox)
if (textBox == null)
throw new ArgumentNullException("textBox");
return textBox.GetValue(MaskProperty) as string;
/// <summary>
/// Sets the mask for a given <see cref="TextBox"/>.
/// </summary>
/// <param name="textBox">
/// The <see cref="TextBox"/> whose mask is to be set.
/// </param>
/// <param name="mask">
/// The mask to set, or <see langword="null"/> to remove any existing mask from <paramref name="textBox"/>.
/// </param>
public static void SetMask(TextBox textBox, string mask)
if (textBox == null)
throw new ArgumentNullException("textBox");
textBox.SetValue(MaskProperty, mask);
/// <summary>
/// Gets the mask expression for the <see cref="TextBox"/>.
/// </summary>
/// <remarks>
/// This method can be used to retrieve the actual <see cref="Regex"/> instance created as a result of setting the mask on a <see cref="TextBox"/>.
/// </remarks>
/// <param name="textBox">
/// The <see cref="TextBox"/> whose mask expression is to be retrieved.
/// </param>
/// <returns>
/// The mask expression as an instance of <see cref="Regex"/>, or <see langword="null"/> if no mask has been applied to <paramref name="textBox"/>.
/// </returns>
public static Regex GetMaskExpression(TextBox textBox)
if (textBox == null)
throw new ArgumentNullException("textBox");
return textBox.GetValue(MaskExpressionProperty) as Regex;
private static void SetMaskExpression(TextBox textBox, Regex regex)
textBox.SetValue(_maskExpressionPropertyKey, regex);
private static void OnMaskChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e)
var textBox = dependencyObject as TextBox;
var mask = e.NewValue as string;
textBox.PreviewTextInput -= textBox_PreviewTextInput;
textBox.PreviewKeyDown -= textBox_PreviewKeyDown;
DataObject.RemovePastingHandler(textBox, Pasting);
DataObject.RemoveCopyingHandler(textBox, NoDragCopy);
CommandManager.RemovePreviewExecutedHandler(textBox, NoCutting);
if (mask == null)
textBox.ClearValue(MaskProperty);
textBox.ClearValue(MaskExpressionProperty);
else
textBox.SetValue(MaskProperty, mask);
SetMaskExpression(textBox, new Regex(mask, RegexOptions.Compiled | RegexOptions.IgnorePatternWhitespace));
textBox.PreviewTextInput += textBox_PreviewTextInput;
textBox.PreviewKeyDown += textBox_PreviewKeyDown;
DataObject.AddPastingHandler(textBox, Pasting);
DataObject.AddCopyingHandler(textBox, NoDragCopy);
CommandManager.AddPreviewExecutedHandler(textBox, NoCutting);
private static void NoCutting(object sender, ExecutedRoutedEventArgs e)
if(e.Command == ApplicationCommands.Cut)
e.Handled = true;
private static void NoDragCopy(object sender, DataObjectCopyingEventArgs e)
if (e.IsDragDrop)
e.CancelCommand();
private static void textBox_PreviewTextInput(object sender, TextCompositionEventArgs e)
var textBox = sender as TextBox;
var maskExpression = GetMaskExpression(textBox);
if (maskExpression == null)
return;
var proposedText = GetProposedText(textBox, e.Text);
if (!maskExpression.IsMatch(proposedText))
e.Handled = true;
private static void textBox_PreviewKeyDown(object sender, KeyEventArgs e)
var textBox = sender as TextBox;
var maskExpression = GetMaskExpression(textBox);
if (maskExpression == null)
return;
string proposedText = null;
//pressing space doesn't raise PreviewTextInput, reasons here http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/446ec083-04c8-43f2-89dc-1e2521a31f6b?prof=required
if (e.Key == Key.Space)
proposedText = GetProposedText(textBox, " ");
// Same story with backspace
else if(e.Key == Key.Back)
proposedText = GetProposedTextBackspace(textBox);
if (proposedText != null && proposedText != string.Empty && !maskExpression.IsMatch(proposedText))
e.Handled = true;
private static void Pasting(object sender, DataObjectPastingEventArgs e)
var textBox = sender as TextBox;
var maskExpression = GetMaskExpression(textBox);
if (maskExpression == null)
return;
if (e.DataObject.GetDataPresent(typeof(string)))
var pastedText = e.DataObject.GetData(typeof(string)) as string;
var proposedText = GetProposedText(textBox, pastedText);
if (!maskExpression.IsMatch(proposedText))
e.CancelCommand();
else
e.CancelCommand();
private static string GetProposedTextBackspace(TextBox textBox)
var text = GetTextWithSelectionRemoved(textBox);
if (textBox.SelectionStart > 0 && textBox.SelectionLength == 0)
text = text.Remove(textBox.SelectionStart-1, 1);
return text;
private static string GetProposedText(TextBox textBox, string newText)
var text = GetTextWithSelectionRemoved(textBox);
text = text.Insert(textBox.CaretIndex, newText);
return text;
private static string GetTextWithSelectionRemoved(TextBox textBox)
var text = textBox.Text;
if (textBox.SelectionStart != -1)
text = text.Remove(textBox.SelectionStart, textBox.SelectionLength);
return text;
【讨论】：
您通过 3 种方式改进了解决方案，但阅读其简短说明并没有敲响警钟。我认为这与在 TextBox 中复制粘贴文本有关，但 Kent 的解决方案已经阻止了错误文本。您能否解释一下改进阻止了哪些用例？谢谢 这些改进可以防止用户违反正则表达式规则。因此，例如，在这些更改之前，您可以使用 Backspace 使规则变为非法。所以如果模式是^123$，你可以输入123，然后删除2，它会让你。现在没有了。其他改进也是如此 - 剪切文本和拖动文本。
我现在明白你的意思了，但只有复制粘贴操作才能让用户到达文本框中开始出现“123”的位置。只输入字符“1”（或任何其他字符）是不可能的，因为它不会验证“^123$”。在字符串中的 typed 上使用退格键将始终尊重该模式，因为先前的输入已经过验证。一些用户肯定会复制粘贴，而您的改进将解决这种边缘情况，这在一段时间内一直是个谜。谢谢
"在输入的字符串上使用退格键将始终尊重模式，因为之前的输入已经过验证。"仅当光标位于文本框末尾时才如此。如果用户将它移到中间和退格，那么你就会遇到问题。
这是一个好主意，我花了一段时间来构建一个遇到此问题的正则表达式。诀窍是引入 optionality （将锚定作为验证 whole 事物所需的）： ^a?(ab)?(abc)?$ 使用该正则表达式用户可以在 b 上退格并留下无效的 ac。您的改进解决了这个问题。【参考方案3】：
我更改了 VitalyB 的代码以支持颜色主题。如果它不符合 RegEx 脚本，它不会阻止用户输入，它只是突出显示文本框。文本框会是没有交互的主题默认，然后根据输入设置后的值默认为浅绿色或红色。您还可以通过以下方式以编程方式设置失败和通过颜色：
b:ColorMasking.PassColor = "Hexadecimal Value"
b:ColorMasking.FailColor = "Hexadecimal Value"
类如下：
public class ColorMasking : DependencyObject
private static readonly DependencyPropertyKey _maskExpressionPropertyKey = DependencyProperty.RegisterAttachedReadOnly("MaskExpression",
typeof(Regex),
typeof(ColorMasking),
new FrameworkPropertyMetadata());
/// <summary>
/// Identifies the <see cref="Mask"/> dependency property.
/// </summary>
///
public static readonly DependencyProperty PassColorProperty = DependencyProperty.RegisterAttached("PassColor",
typeof(string),
typeof(ColorMasking),
new PropertyMetadata("#99FF99"));
public static void SetPassColor(DependencyObject obj, string passColor)
obj.SetValue(PassColorProperty, passColor);
public static string GetPassColor(DependencyObject obj)
return (string)obj.GetValue(PassColorProperty);
public static readonly DependencyProperty FailColorProperty = DependencyProperty.RegisterAttached("FailColor",
typeof(string),
typeof(ColorMasking),
new PropertyMetadata("#FFCCFF"));
public static void SetFailColor(DependencyObject obj, string failColor)
obj.SetValue(FailColorProperty, failColor);
public static string GetFailColor(DependencyObject obj)
return (string)obj.GetValue(FailColorProperty);
public static readonly DependencyProperty MaskProperty = DependencyProperty.RegisterAttached("Mask",
typeof(string),
typeof(ColorMasking),
new FrameworkPropertyMetadata(OnMaskChanged));
private static void OnPassColorChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e)
var textBox = dependencyObject as TextBox;
var color = e.NewValue as string;
textBox.SetValue(PassColorProperty, color);
/// <summary>
/// Identifies the <see cref="MaskExpression"/> dependency property.
/// </summary>
public static readonly DependencyProperty MaskExpressionProperty = _maskExpressionPropertyKey.DependencyProperty;
/// <summary>
/// Gets the mask for a given <see cref="TextBox"/>.
/// </summary>
/// <param name="textBox">
/// The <see cref="TextBox"/> whose mask is to be retrieved.
/// </param>
/// <returns>
/// The mask, or <see langword="null"/> if no mask has been set.
/// </returns>
public static string GetMask(TextBox textBox)
if (textBox == null)
throw new ArgumentNullException("textBox");
return textBox.GetValue(MaskProperty) as string;
/// <summary>
/// Sets the mask for a given <see cref="TextBox"/>.
/// </summary>
/// <param name="textBox">
/// The <see cref="TextBox"/> whose mask is to be set.
/// </param>
/// <param name="mask">
/// The mask to set, or <see langword="null"/> to remove any existing mask from <paramref name="textBox"/>.
/// </param>
public static void SetMask(TextBox textBox, string mask)
if (textBox == null)
throw new ArgumentNullException("textBox");
textBox.SetValue(MaskProperty, mask);
/// <summary>
/// Gets the mask expression for the <see cref="TextBox"/>.
/// </summary>
/// <remarks>
/// This method can be used to retrieve the actual <see cref="Regex"/> instance created as a result of setting the mask on a <see cref="TextBox"/>.
/// </remarks>
/// <param name="textBox">
/// The <see cref="TextBox"/> whose mask expression is to be retrieved.
/// </param>
/// <returns>
/// The mask expression as an instance of <see cref="Regex"/>, or <see langword="null"/> if no mask has been applied to <paramref name="textBox"/>.
/// </returns>
public static Regex GetMaskExpression(TextBox textBox)
if (textBox == null)
throw new ArgumentNullException("textBox");
return textBox.GetValue(MaskExpressionProperty) as Regex;
private static void SetMaskExpression(TextBox textBox, Regex regex)
textBox.SetValue(_maskExpressionPropertyKey, regex);
private static void OnMaskChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e)
var textBox = dependencyObject as TextBox;
var mask = e.NewValue as string;
textBox.PreviewTextInput -= textBox_PreviewTextInput;
textBox.PreviewKeyDown -= textBox_PreviewKeyDown;
DataObject.RemovePastingHandler(textBox, Pasting);
DataObject.RemoveCopyingHandler(textBox, NoDragCopy);
CommandManager.RemovePreviewExecutedHandler(textBox, NoCutting);
if (mask == null)
textBox.ClearValue(MaskProperty);
textBox.ClearValue(MaskExpressionProperty);
else
textBox.SetValue(MaskProperty, mask);
SetMaskExpression(textBox, new Regex(mask, RegexOptions.Compiled | RegexOptions.IgnorePatternWhitespace));
textBox.PreviewTextInput += textBox_PreviewTextInput;
textBox.PreviewKeyDown += textBox_PreviewKeyDown;
DataObject.AddPastingHandler(textBox, Pasting);
DataObject.AddCopyingHandler(textBox, NoDragCopy);
CommandManager.AddPreviewExecutedHandler(textBox, NoCutting);
private static void NoCutting(object sender, ExecutedRoutedEventArgs e)
if (e.Command == ApplicationCommands.Cut)
e.Handled = true;
private static void NoDragCopy(object sender, DataObjectCopyingEventArgs e)
if (e.IsDragDrop)
e.CancelCommand();
private static void textBox_PreviewTextInput(object sender, TextCompositionEventArgs e)
var textBox = sender as TextBox;
var maskExpression = GetMaskExpression(textBox);
string passHex = (string)textBox.GetValue(PassColorProperty);
string failHex = (string)textBox.GetValue(FailColorProperty);
Color passColor = Extensions.ToColorFromHex(passHex);
Color failColor = Extensions.ToColorFromHex(failHex);
if (maskExpression == null)
return;
var proposedText = GetProposedText(textBox, e.Text);
if (!maskExpression.IsMatch(proposedText))
textBox.Background = new SolidColorBrush(failColor);
else
textBox.Background = new SolidColorBrush(passColor);
private static void textBox_PreviewKeyDown(object sender, KeyEventArgs e)
var textBox = sender as TextBox;
var maskExpression = GetMaskExpression(textBox);
string passHex = (string)textBox.GetValue(PassColorProperty);
string failHex = (string)textBox.GetValue(FailColorProperty);
Color passColor = Extensions.ToColorFromHex(passHex);
Color failColor = Extensions.ToColorFromHex(failHex);
if (maskExpression == null)
return;
string proposedText = null;
//pressing space doesn't raise PreviewTextInput, reasons here http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/446ec083-04c8-43f2-89dc-1e2521a31f6b?prof=required
if (e.Key == Key.Space)
proposedText = GetProposedText(textBox, " ");
// Same story with backspace
else if (e.Key == Key.Back)
proposedText = GetProposedTextBackspace(textBox);
if (proposedText != null && !maskExpression.IsMatch(proposedText))
textBox.Background = new SolidColorBrush(failColor);
else
textBox.Background = new SolidColorBrush(passColor);
private static void Pasting(object sender, DataObjectPastingEventArgs e)
TextBox textBox = sender as TextBox;
var maskExpression = GetMaskExpression(textBox);
string passHex = (string)textBox.GetValue(PassColorProperty);
string failHex = (string)textBox.GetValue(FailColorProperty);
Color passColor = Extensions.ToColorFromHex(passHex);
Color failColor = Extensions.ToColorFromHex(failHex);
if (maskExpression == null)
return;
if (e.DataObject.GetDataPresent(typeof(string)))
var pastedText = e.DataObject.GetData(typeof(string)) as string;
var proposedText = GetProposedText(textBox, pastedText);
if (!maskExpression.IsMatch(proposedText))
textBox.Background = new SolidColorBrush(failColor);
else
textBox.Background = new SolidColorBrush(passColor);
else
textBox.Background = new SolidColorBrush(failColor);
private static string GetProposedTextBackspace(TextBox textBox)
var text = GetTextWithSelectionRemoved(textBox);
if (textBox.SelectionStart > 0)
text = text.Remove(textBox.SelectionStart - 1, 1);
return text;
private static string GetProposedText(TextBox textBox, string newText)
var text = GetTextWithSelectionRemoved(textBox);
text = text.Insert(textBox.CaretIndex, newText);
return text;
private static string GetTextWithSelectionRemoved(TextBox textBox)
var text = textBox.Text;
if (textBox.SelectionStart != -1)
text = text.Remove(textBox.SelectionStart, textBox.SelectionLength);
return text;
要运行，脚本需要 Aaron C 编写的类，此处解释：Silverlight/WPF sets ellipse with hexadecimal colour 此处显示：http://www.wiredprairie.us/blog/index.php/archives/659
如果网站被移动，代码如下：
public static class Extensions
public static void SetFromHex(this Color c, string hex)
Color c1 = ToColorFromHex(hex);
c.A = c1.A;
c.R = c1.R;
c.G = c1.G;
c.B = c1.B;
public static Color ToColorFromHex(string hex)
if (string.IsNullOrEmpty(hex))
throw new ArgumentNullException("hex");
// remove any "#" characters
while (hex.StartsWith("#"))
hex = hex.Substring(1);
int num = 0;
// get the number out of the string
if (!Int32.TryParse(hex, System.Globalization.NumberStyles.HexNumber, null, out num))
throw new ArgumentException("Color not in a recognized Hex format.");
int[] pieces = new int[4];
if (hex.Length > 7)
pieces[0] = ((num >> 24) & 0x000000ff);
pieces[1] = ((num >> 16) & 0x000000ff);
pieces[2] = ((num >> 8) & 0x000000ff);
pieces[3] = (num & 0x000000ff);
else if (hex.Length > 5)
pieces[0] = 255;
pieces[1] = ((num >> 16) & 0x000000ff);
pieces[2] = ((num >> 8) & 0x000000ff);
pieces[3] = (num & 0x000000ff);
else if (hex.Length == 3)
pieces[0] = 255;
pieces[1] = ((num >> 8) & 0x0000000f);
pieces[1] += pieces[1] * 16;
pieces[2] = ((num >> 4) & 0x000000f);
pieces[2] += pieces[2] * 16;
pieces[3] = (num & 0x000000f);
pieces[3] += pieces[3] * 16;
return Color.FromArgb((byte)pieces[0], (byte)pieces[1], (byte)pieces[2], (byte)pieces[3]);
【讨论】：
【参考方案4】：private void TextBox1_SelectionChanged(object sender, RoutedEventArgs e)
string txt = TextBox1.Text;
if (txt != "")
TextBox1.Text = Regex.Replace(TextBox1.Text, "[^0-9]", "");
if (txt != TextBox1.Text)
TextBox1.Select(TextBox1.Text.Length, 0);
【讨论】：
我不知道如何使它成为自定义属性，但它是一个简单的解决方案。如果有人能像肯特那样将其转换为财产，我将不胜感激。【参考方案5】：这里是现有解决方案的另一个版本。这是一个模拟“TextChanging”事件的行为，提供旧文本、新文本和取消更改的标志。这样我们就可以实现我们想要的任何过滤器。
我摆脱了仅用于空格字符的“PreviewKeyDown”处理程序。 TextBox 似乎使用路由命令来管理所有内容，并且“Space”确实有自己的命令，尽管它不是公开的。我还添加了对其他键盘快捷键的支持，例如“Ctrl+Backspace”（删除前一个单词）。
public class TextChangingBehavior : Behavior<TextBox>
public event EventHandler<TextChangingEventArgs> TextChanging;
protected override void OnAttached()
base.OnAttached();
AssociatedObject.PreviewTextInput += OnPreviewTextInput;
CommandManager.AddPreviewExecutedHandler(AssociatedObject, OnPreviewExecutedHandler);
DataObject.AddCopyingHandler(AssociatedObject, OnCopying);
DataObject.AddPastingHandler(AssociatedObject, OnPasting);
protected override void OnDetaching()
base.OnDetaching();
AssociatedObject.PreviewTextInput -= OnPreviewTextInput;
CommandManager.RemovePreviewExecutedHandler(AssociatedObject, OnPreviewExecutedHandler);
DataObject.RemoveCopyingHandler(AssociatedObject, OnCopying);
DataObject.RemovePastingHandler(AssociatedObject, OnPasting);
#region Text
private enum CharCategory
LetterOrDigit,
Whitespace,
Other
private CharCategory GetCharCategory(char c)
if (char.IsLetterOrDigit(c))
return CharCategory.LetterOrDigit;
else if (char.IsWhiteSpace(c))
return CharCategory.Whitespace;
else
return CharCategory.Other;
private string GetText(string input = null)
var box = AssociatedObject;
var text = box.Text ?? string.Empty;
if (input != null)
// Delete selection
var deleteCount = box.SelectionLength;
if (deleteCount > 0)
text = text.Remove(box.SelectionStart, deleteCount);
// Insert input
if (input.Length > 0)
text = text.Insert(box.CaretIndex, input);
return text;
#endregion
private void OnPreviewExecutedHandler(object sender, ExecutedRoutedEventArgs e)
var box = AssociatedObject;
var selectionExists = box.SelectionLength > 0;
var caretIndex = box.CaretIndex;
string newText = null;
if (e.Command == ApplicationCommands.Cut)
if (selectionExists)
newText = GetText(string.Empty);
else if (e.Command == EditingCommands.Backspace)
if (selectionExists)
newText = GetText(string.Empty);
else if (caretIndex > 0)
newText = GetText().Remove(caretIndex - 1, 1);
else if (e.Command == EditingCommands.Delete)
if (selectionExists)
newText = GetText(string.Empty);
else
newText = GetText();
if (caretIndex >= newText.Length)
newText = null;
else
newText = newText.Remove(caretIndex, 1);
else if (e.Command == EditingCommands.DeletePreviousWord)
if (selectionExists)
newText = GetText(string.Empty);
else if (caretIndex > 0)
newText = GetText();
var startIndex = caretIndex;
// Include whitespaces
do
startIndex--;
while (startIndex > 0 && char.IsWhiteSpace(newText[startIndex]));
// Include the next block
var currentCategory = GetCharCategory(newText[startIndex]);
while (startIndex > 0 && GetCharCategory(newText[startIndex - 1]) == currentCategory)
startIndex--;
newText = newText.Remove(startIndex, caretIndex - startIndex);
else if (e.Command == EditingCommands.DeleteNextWord)
if (selectionExists)
newText = GetText(string.Empty);
else
newText = GetText();
if (caretIndex >= newText.Length)
newText = null;
else
var endIndex = caretIndex + 1;
// Include the current block
var currentCategory = GetCharCategory(newText[caretIndex]);
while (endIndex < newText.Length && GetCharCategory(newText[endIndex]) == currentCategory)
endIndex++;
// Include whitespaces
while (endIndex < newText.Length && char.IsWhiteSpace(newText[endIndex]))
endIndex++;
newText = newText.Remove(caretIndex, endIndex - caretIndex);
else if (e.Command is RoutedUICommand cmd && new[] "Space", "ShiftSpace" .Contains(cmd.Name))
newText = GetText(" ");
if (newText != null && OnProcessChange(newText))
e.Handled = true;
private void OnCopying(object sender, DataObjectCopyingEventArgs e)
if (e.IsDragDrop)
if (OnProcessChange(GetText(string.Empty)))
e.CancelCommand();
private void OnPasting(object sender, DataObjectPastingEventArgs e)
if (e.DataObject.GetDataPresent(typeof(string)))
if (OnProcessChange(GetText((string)e.DataObject.GetData(typeof(string)))))
e.CancelCommand();
private void OnPreviewTextInput(object sender, TextCompositionEventArgs e)
if (!string.IsNullOrEmpty(e.Text))
if (OnProcessChange(GetText(e.Text)))
e.Handled = true;
private bool OnProcessChange(string newValue)
var oldValue = GetText();
if (string.Equals(oldValue, newValue, StringComparison.Ordinal))
return false;
else
var args = new TextChangingEventArgs(oldValue, newValue);
OnTextChanging(args);
return args.Cancel;
protected virtual void OnTextChanging(TextChangingEventArgs e)
TextChanging?.Invoke(this, e);
public class TextChangingEventArgs : EventArgs
public string OldValue get;
public string NewValue get;
public bool Cancel get; set;
public TextChangingEventArgs(string oldValue, string newValue)
OldValue = oldValue;
NewValue = newValue;
【讨论】：
正是我想要的。只想添加 Microsoft.Xaml.Behaviors.Wpf nuget 包才能使其正常工作。【参考方案6】：另一种可能的解决方案是使用 Winforms 中的“MaskedTextBox”使用的“MaskedTextProvider”类使用“Masked TextBox”wpf 实现之一。
这里有两种可能的解决方案 -> https://wpftoolkit.codeplex.com/wikipage?title=MaskedTextBox 和这里 -> http://marlongrech.wordpress.com/2007/10/28/masked-textbox/
【讨论】：
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