如果两个对象的背景颜色匹配，如何生成新的背景颜色？
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【中文标题】如果两个对象的背景颜色匹配，如何生成新的背景颜色？【英文标题】：How to generate new back colour if two object's back colour match? 【发布时间】：2019-05-11 17:11:20 【问题描述】：我有一个相当简单的 WCF 程序，用户可以在其中单击两个按钮：ChangeBackGroundColour 和 ChangeButtonColour。
WCF 服务从颜色列表中返回一个随机颜色，并且该字符串通过 switch case 语句指示两个对象的颜色。
但是，对象的颜色不能相同。如何阻止重复？
这是我的代码：
前端
public partial class Front_End : Form
RandomColourServiceReference.RandomColoursServiceClient ws = null;
string BackGroundColour get; set;
string TextColour get; set;
public Front_End()
InitializeComponent();
private void Front_End_Load(object sender, EventArgs e)
ws = new RandomColourServiceReference.RandomColoursServiceClient();
private void BtnChangeBack_Click(object sender, EventArgs e)
BackGroundColour = ws.GenerateRandomColour();
switch (BackGroundColour)
case "Red":
this.BackColor = Color.Red;
break;
case "Blue":
this.BackColor = Color.Blue;
break;
case "Black":
this.BackColor = Color.Black;
break;
case "Purple":
this.BackColor = Color.Purple;
break;
case "Green":
this.BackColor = Color.Green;
break;
private void BtnChangeButton_Click(object sender, EventArgs e)
TextColour = ws.GenerateRandomColour();
switch (TextColour)
case "Red":
btnChangeButton.BackColor = Color.Red;
btnChangeBack.BackColor = Color.Red;
break;
case "Blue":
btnChangeButton.BackColor = Color.Blue;
btnChangeBack.BackColor = Color.Blue;
break;
case "Black":
btnChangeButton.BackColor = Color.Black;
btnChangeBack.BackColor = Color.Black;
break;
case "Purple":
btnChangeButton.BackColor = Color.Purple;
btnChangeBack.BackColor = Color.Purple;
break;
case "Green":
btnChangeButton.BackColor = Color.Green;
btnChangeBack.BackColor = Color.Green;
break;
RandomColourService
public class RandomColoursService : IRandomColoursService
public string GenerateRandomColour()
//Declare and initialize a list of string colours
List<String> colours = new List<String>();
colours.AddRange(new String[] "Red", "Blue", "Green", "Pink", "Purple", "Black");
//create new instance of random
Random rand = new Random();
//return a random colour in array
return colours[rand.Next(0, colours.Count)];
IRandomColourService
[ServiceContract]
public interface IRandomColoursService
[OperationContract]
string GenerateRandomColour();
我觉得应该涉及一个 while 循环，但我不太确定。
或者也许我应该让 2 个对象从 wcf 返回，而不是只返回一个，然后检查它们在 wcf 中是否重复，如果是，则生成一个新对象？ 所以它只会发送 2 种不同的颜色。那会是最好的吗？
*这是尝试添加更多属性后的更新代码
前端
public partial class Front_End : Form
RandomColoursService.RandomColoursServiceClient ws = null;
/*create two properties that can:385
A. set the initial colours for the form objects.
B. be passed to wcf service as a used color to be removed from the list of colours that could potentially be returned next. */
Color BackGroundColour get; set; = Color.Blue;
Color TextColour get; set; = Color.Red;
Color ButtonColour get; set; = Color.Black;
public Front_End()
//objects are initilized with colours.
InitializeComponent();
btnChangeBack.BackColor = ButtonColour;
btnChangeButton.BackColor = ButtonColour;
btnChangeText.BackColor = ButtonColour;
this.BackColor = BackGroundColour;
lblTitle.ForeColor = TextColour;
btnChangeBack.ForeColor = TextColour;
btnChangeButton.ForeColor = TextColour;
btnChangeText.ForeColor = TextColour;
private void Front_End_Load(object sender, EventArgs e)
//create new instance of wcf service
ws = new RandomColoursService.RandomColoursServiceClient();
private void BtnChangeBack_Click(object sender, EventArgs e)
//This list is populated with the with current colours
List<Color> UsedColours = new List<Color>() TextColour, ButtonColour, BackGroundColour;
//Call for another colour, pass in the current colour to be removed from list.
BackGroundColour = ws.GenerateRandomColour(UsedColours);
//set object colour to returned colour
this.BackColor = BackGroundColour;
private void BtnChangeButton_Click(object sender, EventArgs e)
//This list is populated with the with current colours
List<Color> UsedColours = new List<Color>() TextColour, BackGroundColour, ButtonColour;
//Call for another colour, pass in the current colour to be removed from list.
ButtonColour = ws.GenerateRandomColour(UsedColours);
//set object colour to returned colour
btnChangeButton.BackColor = ButtonColour;
btnChangeBack.BackColor = ButtonColour;
btnChangeText.BackColor = ButtonColour;
private void BtnChangeText(object sender, EventArgs e)
//This list is populated with the with current colours
List<Color> UsedColours = new List<Color>() BackGroundColour, ButtonColour, TextColour;
//Call for another colour, pass in the current colour to be removed from list.
TextColour = ws.GenerateRandomColour(UsedColours);
//set object colour to returned colour
btnChangeButton.ForeColor = TextColour;
btnChangeBack.ForeColor = TextColour;
btnChangeText.ForeColor = TextColour;
lblTitle.ForeColor = TextColour;
IRandomColoursService
[ServiceContract]
public interface IRandomColoursService
[OperationContract]
//As a parameter, pass in a list of coloured.
//The list will be populated with the current colours on the front end,
//when a button is clicked a new call is made to wcf.
Color GenerateRandomColour(List<Color> UsedColours);
RandomColoursService
public class RandomColoursService : IRandomColoursService
public Color GenerateRandomColour(List<Color> UsedColours)
//This is a list of potential colours that wcf can send.
List<Color> Colours = new List<Color>()
Color.Red, Color.Blue, Color.Black, Color.Green, Color.Indigo, Color.Orange
;
//This is a list of available colours once the current object colours are removed from the list.
List<Color> AvailableColours = Colours.Except(UsedColours).ToList();
Random rand = new Random();
return Colours[rand.Next(0, AvailableColours.Count)];
为了澄清，我应该在调用 wcf 时传递一个 UsedColours 列表。从颜色列表中扣除 UsedColors，然后可用颜色列表保存剩余的颜色。然后每次调用都应该返回可用颜色列表中的一个随机颜色？
我哪里出错了？
【问题讨论】：
【参考方案1】：如果您的代码可以修改（包括接口），我建议进行以下更改：
由于您有两个引用所选颜色的属性，您可以分配默认值并使用这些值来设置表单和按钮的初始颜色。
这些属性随后可用于引用 GenerateRandomColour([Color]) 方法无法选择的已使用颜色。
传递给方法的 Color 参数在随机选择一个新颜色之前从颜色列表中删除：
[ServiceContract]
public interface IRandomColoursService
[OperationContract]
Color GenerateRandomColour(Color UsedColor);
public class RandomColoursService : IRandomColoursService
public Color GenerateRandomColour(Color UsedColor)
List<Color> colours = new List<Color>()
Color.Red, Color.Blue, Color.Green, Color.Pink, Color.Purple, Color.Black
;
colours.Remove(UsedColor);
Random rand = new Random();
return colours[rand.Next(0, colours.Count)];
RandomColourServiceReference.RandomColoursServiceClient ws = null;
Color BackGroundColour get; set; = Color.Red;
Color TextColour get; set; = Color.Black;
public Front_End()
InitializeComponent();
btnChangeButton.BackColor = TextColour;
btnChangeBack.BackColor = TextColour;
this.BackColor = BackGroundColour;
private void BtnChangeButton_Click(object sender, EventArgs e)
TextColour = ws.GenerateRandomColour(BackGroundColour);
btnChangeButton.BackColor = TextColour;
btnChangeBack.BackColor = TextColour;
private void BtnChangeBack_Click(object sender, EventArgs e)
BackGroundColour = GenerateRandomColour(TextColour);
this.BackColor = BackGroundColour;
更新：
如果要添加更多控件和相关属性，请更改 GenerateRandomColour 方法，使其接受 List<Color> 而不是单个颜色引用。
（此处使用LINQ 的Except() 扩展方法来过滤使用另一个列表）
例如：
public Color GenerateRandomColour(List<Color> UsedColor)
List<Color> colours = new List<Color>()
Color.Red, Color.Blue, Color.Green, Color.Pink, Color.Purple, Color.Black
;
List<Color> AvailableColours = colours.Except(UsedColor).ToList();
Random rand = new Random();
return AvailableColours[rand.Next(0, AvailableColours.Count)];
Color BackGroundColour get; set; = Color.Black;
Color TextColour get; set; = Color.Red;
Color AnotherColour get; set; = Color.Green;
private void BtnChangeButton_Click(object sender, EventArgs e)
List<Color> UsedColors = new List<Color>() BackGroundColour, AnotherColour ;
TextColour = ws.GenerateRandomColour(UsedColors);
btnChangeButton.BackColor = TextColour;
btnChangeBack.BackColor = TextColour;
//(...)
等等。
但是，如果有很多属性，这可能会变得太麻烦。
您可以构建一个专门的类，将颜色映射到控件（使用它们的引用或名称），然后用于与GenerateRandomColour() 方法交换信息。
【讨论】：
天哪。你可以有一个列表或一组颜色！？很高兴知道！我尝试扩展并添加第三个属性，以便有一个按钮来更改背景、按钮和文本颜色。我基本上只是添加了一个额外的参数，但 colours.Remove 只能与 1 个参数一起使用。知道如何从列表中删除 2 个项目吗？还是不能做？ 列表可以包含任何内容。如果您需要更改更多属性，请参阅更新以了解可能的替代方法。此处使用List.Except(List) 扩展方法来过滤使用另一个列表。
我得到 “参数 1：无法从 'System.Collections.Generic.ListGenerateRandomColour() 方法试图返回 List<Color> 而不是 Color。或者类似的东西。
好的，吉米。这应该如何？感觉好像我已经尝试了所有的组合。 :P 虽然老实说我对我的导师这么说然后她告诉我我很愚蠢。如果您好心，我已经对原始代码进行了编辑！以上是关于如果两个对象的背景颜色匹配，如何生成新的背景颜色？的主要内容，如果未能解决你的问题，请参考以下文章
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