关于WinForm下DataGridView控件行的选择的问题

Posted 2023-03-19

我在DataGridView1控件中显示考题的信息，双击某一行考题后可以将这行考题添加到DataGridView2，考题有分类QuestionsType字段，我想在选择了QuestionsType的值是A的考题后，设置QuestionsType的值为B的考题都为不可选考题，有什么办法可以实现这个操作吗？我的意思是在DataGridView1中我显示了所有可选考题的信息，双击某一行后，可以把这一行的考题信息添加到DataGridView2中，那么这个时候，我就要判断一下我先择考题的QuestionsType值，如果是A的话，那么我就要让DataGridView1中所有QuestionsType值为B的考题是不可选的。请各位大侠指点一下，谢谢了。

在1里面绑定一个id列,隐藏,然后你通过datagridview的行选择事件,取得选中行的id,再通过id去数据库查QuestionsType,然后根据条件查出数据给2绑定数据,同时设置行的datagridview[列,行].readonly=true; 参考技术A 你最好截个图，尤其是数据库，没有明白你的意思。尤其是那个字段要干嘛。

一个Winform下DataGridView控件外观的自定义类

一、关于起因

最近非常频繁的使用DataGridView控件，VS提供的Winform下DataGridView的默认样式非常难看。如果做美化处理的话，需要调整的地方非常多，且该控件的很多设置属性非常的晦涩，不是很人性化。每次进行设置都煞费脑筋，并且需要设置的DataGridView控件又比较多，如果手工一个一个调整非常麻烦。如果在每个窗体里逐个一行一行的用代码来设置，会造成代码很凌乱、琐碎，因此我对DataGridView格式设置的常用项封装到一个Helper类，通过这个帮助类可以一步到位完成设置。

对DataGridView控件，我需要完成的一些基本的格式控制,包括以下一些内容:

1、标题行背景色、前景色、字体设置、平面化样式、行高

2、标题列宽度，平面化样式

3、偶数行背景色、前景色

4、奇数行背景色、前景色

5、数据行高度、字体

6、列宽度，对齐方式

7、禁止编辑、添加、删除、调整行高、列宽、排序

8、去除控件外边框

最终处理过后的风格类似如下图所示

二、CGridHelper类模块的调用

最终我所希望的实现格式化DataGridView控件的形式是通过一行代码来实现,类似如下所示:

1         Dim mGridHelper As New CGridHelper(GridVersion, Color.FromArgb(250, 250, 250),
2             New Font("微软雅黑", 10), 30, Color.FromArgb(159, 210, 235), Color.FromArgb(0, 0, 0), 24,
3             New Font("微软雅黑", 9), 30, Color.FromArgb(250, 250, 250), Color.FromArgb(225, 225, 225), Color.FromArgb(0, 0, 0),
4             "0;80;70;595", "M;M;M;L")

其中列宽的控制通过一个字符串来设置,用分号来分隔数字,各数字依次设置对应列的宽度;列的对齐方式也类似,不过左、中、右分别用字母L/M/R表示。

三、CGridHelper类模块代码

接下来直接上CGridHelper类模块的代码了，代码还比较粗糙,但是满足我自己的需求就够了。

  1 Public Class CGridHelper
  2     Private mGrid As DataGridView
  3     Public Property Grid() As DataGridView
  4         Get
  5             Return mGrid
  6         End Get
  7         Set(ByVal value As DataGridView)
  8             mGrid = value
  9             mGrid.BorderStyle = BorderStyle.None
 10             mGrid.ColumnHeadersBorderStyle = DataGridViewHeaderBorderStyle.Single
 11             mGrid.ColumnHeadersDefaultCellStyle.WrapMode = DataGridViewTriState.False
 12             mGrid.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.DisableResizing
 13             mGrid.RowHeadersBorderStyle = DataGridViewHeaderBorderStyle.Single
 14             mGrid.RowHeadersWidthSizeMode = DataGridViewRowHeadersWidthSizeMode.DisableResizing
 15             mGrid.AutoSizeRowsMode = DataGridViewAutoSizeRowsMode.None
 16             mGrid.DefaultCellStyle.WrapMode = DataGridViewTriState.True
 17             mGrid.EnableHeadersVisualStyles = False
 18             mGrid.AllowUserToResizeRows = False
 19             mGrid.SelectionMode = DataGridViewSelectionMode.FullRowSelect
 20             mGrid.ReadOnly = True
 21             mGrid.AllowUserToAddRows = False
 22             mGrid.AllowUserToDeleteRows = False
 23             For i = 0 To mGrid.Columns.Count - 1
 24                 mGrid.Columns(i).SortMode = DataGridViewColumnSortMode.NotSortable
 25             Next
 26         End Set
 27     End Property
 28 
 29     Private mOddRowBackColor As Color
 30     Public Property OddRowBackColor() As Color
 31         Get
 32             Return mOddRowBackColor
 33         End Get
 34         Set(ByVal value As Color)
 35             mOddRowBackColor = value
 36             If mGrid.Rows.Count = 0 Then Exit Property
 37             For i = 0 To mGrid.Rows.Count - 1 Step 2
 38                 mGrid.Rows(i).DefaultCellStyle.BackColor = value
 39             Next
 40         End Set
 41     End Property
 42 
 43     Private mHeaderBackColor As Color
 44     Public Property HeaderBackColor() As Color
 45         Get
 46             Return mHeaderBackColor
 47         End Get
 48         Set(ByVal value As Color)
 49             mHeaderBackColor = value
 50             mGrid.ColumnHeadersDefaultCellStyle.BackColor = value
 51         End Set
 52     End Property
 53 
 54     Private mEvenRowBackColor As Color
 55     Public Property EvenRowBackColor() As Color
 56         Get
 57             Return mEvenRowBackColor
 58         End Get
 59         Set(ByVal value As Color)
 60             mEvenRowBackColor = value
 61             If mGrid.Rows.Count = 0 Then Exit Property
 62             For i = 1 To mGrid.Rows.Count - 1 Step 2
 63                 mGrid.Rows(i).DefaultCellStyle.BackColor = value
 64             Next
 65         End Set
 66     End Property
 67 
 68     Private mGridColor As Color
 69     Public Property GridColor() As Color
 70         Get
 71             Return mGridColor
 72         End Get
 73         Set(ByVal value As Color)
 74             mGridColor = value
 75             mGrid.GridColor = value
 76         End Set
 77     End Property
 78 
 79     Private mColumnWidth As String
 80     Public Property ColumnWidth() As String
 81         Get
 82             Return mColumnWidth
 83         End Get
 84         Set(ByVal value As String)
 85             mColumnWidth = value
 86             Dim mColCount As Integer = mGrid.ColumnCount
 87             Dim mWidths() As String = value.Split(";")
 88             For i = 0 To mWidths.Length - 1
 89                 If i + 1 > mColCount Then Exit For
 90                 If mWidths(i) <= 0 Then
 91                     mGrid.Columns(i).Visible = False
 92                 Else
 93                     mGrid.Columns(i).Width = mWidths(i)
 94                 End If
 95             Next
 96         End Set
 97     End Property
 98 
 99     Private mColumnAlignment As String
100     Public Property ColumnAlignment() As String
101         Get
102             Return mColumnAlignment
103         End Get
104         Set(ByVal value As String)
105             mColumnAlignment = value
106             Dim mColCount As Integer = mGrid.ColumnCount
107             Dim mAlignments() As String = value.Split(";")
108             For i = 0 To mAlignments.Length - 1
109                 If i + 1 > mColCount Then Exit For
110                 Select Case mAlignments(i)
111                     Case Is = "L"
112                         mGrid.Columns(i).DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleLeft
113                     Case Is = "R"
114                         mGrid.Columns(i).DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleRight
115                     Case Is = "M"
116                         mGrid.Columns(i).DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter
117                     Case Else
118                         mGrid.Columns(i).DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleLeft
119                 End Select
120             Next
121         End Set
122     End Property
123 
124     Private mHeaderFont As Font
125     Public Property HeaderFont() As Font
126         Get
127             Return mHeaderFont
128         End Get
129         Set(ByVal value As Font)
130             mHeaderFont = value
131             mGrid.ColumnHeadersDefaultCellStyle.Font = value
132         End Set
133     End Property
134 
135     Private mHeaderHeight As Integer
136     Public Property HeaderHeight() As Integer
137         Get
138             Return mHeaderHeight
139         End Get
140         Set(ByVal value As Integer)
141             mHeaderHeight = value
142             mGrid.ColumnHeadersHeight = value
143         End Set
144     End Property
145 
146     Private mHeaderForeColor As Color
147     Public Property HeaderForeColor() As Color
148         Get
149             Return mHeaderForeColor
150         End Get
151         Set(ByVal value As Color)
152             mHeaderForeColor = value
153             mGrid.ColumnHeadersDefaultCellStyle.ForeColor = value
154         End Set
155     End Property
156 
157     Private mRowHeaderWidth As Integer
158     Public Property RowHeaderWidth() As Integer
159         Get
160             Return mRowHeaderWidth
161         End Get
162         Set(ByVal value As Integer)
163             mRowHeaderWidth = value
164             mGrid.RowHeadersWidth = value
165         End Set
166     End Property
167 
168     Private mRowHeight As Integer
169     Public Property RowHeight() As Integer
170         Get
171             Return mRowHeight
172         End Get
173         Set(ByVal value As Integer)
174             mRowHeight = value
175             For i = 0 To mGrid.Rows.Count - 1
176                 mGrid.Rows(i).Height = value
177             Next
178         End Set
179     End Property
180 
181     Private mRowFont As Font
182     Public Property RowFont() As Font
183         Get
184             Return mRowFont
185         End Get
186         Set(ByVal value As Font)
187             mRowFont = value
188             mGrid.RowsDefaultCellStyle.Font = value
189         End Set
190     End Property
191 
192     Private mBackColor As Color
193     Public Property BackColor() As Color
194         Get
195             Return mBackColor
196         End Get
197         Set(ByVal value As Color)
198             mBackColor = value
199             mGrid.BackgroundColor = value
200         End Set
201     End Property
202 
203     Public Sub New(TargetGrid As DataGridView, BackColor As Color, HeaderFont As Font, HeaderHeight As Integer,
204             HeaderBackColor As Color, HeaderForeColor As Color, RowHeaderWidth As Integer,
205             RowFont As Font, RowHeight As Integer, OddRowBackColor As Color, EvenRowBackColor As Color,
206             GridColor As Color, ColumnWidth As String, ColumnAlignment As String)
207         Me.Grid = TargetGrid
208         Me.BackColor = BackColor
209 
210         Me.HeaderFont = HeaderFont
211         Me.HeaderHeight = HeaderHeight
212         Me.HeaderBackColor = HeaderBackColor
213         Me.HeaderForeColor = HeaderForeColor
214         Me.RowHeaderWidth = RowHeaderWidth
215 
216         Me.RowFont = RowFont
217         Me.RowHeight = RowHeight
218         Me.OddRowBackColor = OddRowBackColor
219         Me.EvenRowBackColor = EvenRowBackColor
220 
221         Me.GridColor = GridColor
222         Me.ColumnWidth = ColumnWidth
223         Me.ColumnAlignment = ColumnAlignment
224     End Sub
225 
226     Public Sub ReSetStyle()
227         ReSetStyle(Me.BackColor, Me.HeaderFont, Me.HeaderHeight, Me.HeaderBackColor, Me.HeaderForeColor, Me.RowHeaderWidth,
228                  Me.RowFont, Me.RowHeight, Me.OddRowBackColor, Me.EvenRowBackColor, Me.GridColor, Me.ColumnWidth, Me.ColumnAlignment)
229     End Sub
230 
231     Private Sub ReSetStyle(BackColor As Color, HeaderFont As Font, HeaderHeight As Integer,
232             HeaderBackColor As Color, HeaderForeColor As Color, RowHeaderWidth As Integer,
233             RowFont As Font, RowHeight As Integer, OddRowBackColor As Color, EvenRowBackColor As Color,
234             GridColor As Color, ColumnWidth As String, ColumnAlignment As String)
235         Me.BackColor = BackColor
236 
237         Me.HeaderFont = HeaderFont
238         Me.HeaderHeight = HeaderHeight
239         Me.HeaderBackColor = HeaderBackColor
240         Me.HeaderForeColor = HeaderForeColor
241         Me.RowHeaderWidth = RowHeaderWidth
242 
243         Me.RowFont = RowFont
244         Me.RowHeight = RowHeight
245         Me.OddRowBackColor = OddRowBackColor
246         Me.EvenRowBackColor = EvenRowBackColor
247 
248         Me.GridColor = GridColor
249         Me.ColumnWidth = ColumnWidth
250         Me.ColumnAlignment = ColumnAlignment
251     End Sub
252 End Class