DataGridTextBoxColumnTrim：DataGrid不能完全显示时显示，部分显示“...”

DataGrid控件中的单元格中的内容如果比单元格还大的话，就会自动剪切后面过多的部分。

下面的代码提供一个解决方案，当单元格不够长的时候，显示部分+“...”。

效果：

 

 

代码如下：

1. using System;
2. using System.Drawing;
3. using System.Collections;
4. using System.ComponentModel;
5. using System.Windows.Forms;
6. using System.Data;
8. namespace LJCM
9. {
10.     /* YTY 2008/11/26添加
11.      * 当不能完全显示时，显示部分+"..."
12.     * */
13.     /// <summary>
14.     /// DataGridTextBoxTrim 当不能完全显示时，以“...”代替
15.     /// </summary>
16.     public class DataGridTextBoxColumnTirm:DataGridTextBoxColumn
17.     {
18.         public DataGridTextBoxColumnTirm()
19.         {
20.             //
21.             // TODO: 在此处添加构造函数逻辑
22.             //
23.         }
25.         protected override void Paint(Graphics g, Rectangle bounds, CurrencyManager source, int rowNum)
26.         {
27.             
28.             string text = GetColumnValueAtRow(source,rowNum).ToString();
29.             if(g.MeasureString(text,this.DataGridTableStyle.DataGrid.Font,bounds.Width).Height
30.                 >bounds.Height)
31.             {
32.                 Brush backBrush = new SolidBrush(base.DataGridTableStyle.BackColor);
33.                 Brush foreBrush    = new SolidBrush(base.DataGridTableStyle.ForeColor);
34.                 Rectangle rect = bounds;
35.                 StringFormat format   = new StringFormat();
36.                 format.FormatFlags = StringFormatFlags.LineLimit;
37.                 format.Trimming = StringTrimming.EllipsisCharacter;
38.                 g.DrawString(text,this.DataGridTableStyle.DataGrid.Font, foreBrush, rect, format);
39.                 format.Dispose();
40.             }
41.             else
42.             {
43.                 base.Paint(g,bounds,source,rowNum);
44.             }
45.             /*end*/
46.         }
48.         protected override void Paint(Graphics g, Rectangle bounds, CurrencyManager source, int rowNum, bool alignToRight)
49.         {
50.             string text = GetColumnValueAtRow(source,rowNum).ToString();
51.             if(g.MeasureString(text,this.DataGridTableStyle.DataGrid.Font,bounds.Width).Height
52.                 >bounds.Height)
53.             {                                                                                     
54.                 //Brush backBrush = new SolidBrush(base.DataGridTableStyle.BackColor);
55.                 Brush foreBrush = new SolidBrush(base.DataGridTableStyle.ForeColor);
56.                 Rectangle rect = bounds;
57.                 StringFormat format   = new StringFormat();
58.                 if(alignToRight)
59.                 {
60.                     format.FormatFlags = StringFormatFlags.LineLimit;
61.                     format.Trimming = StringTrimming.EllipsisPath;
62.                 }
63.                 else
64.                 {
65.                     format.FormatFlags = StringFormatFlags.LineLimit;
66.                     format.Trimming = StringTrimming.EllipsisCharacter;
67.                 }
68.                 g.DrawString(text,this.DataGridTableStyle.DataGrid.Font, foreBrush, rect, format);
69.                 format.Dispose();
70.             }
71.             else
72.             {
73.                 base.Paint(g,bounds,source,rowNum,alignToRight);
74.             }
75.             /* end*/
76.         }
78.         protected override void Paint(Graphics g, Rectangle bounds, CurrencyManager source, int rowNum, Brush backBrush, Brush foreBrush, bool alignToRight)
79.         {
80.             string text = GetColumnValueAtRow(source,rowNum).ToString();
81.             g.FillRectangle(backBrush,bounds);
83.             if(g.MeasureString(text,this.DataGridTableStyle.DataGrid.Font,bounds.Width).Height
84.                 >bounds.Height)
85.             {
86.                 //Brush backBrush = new SolidBrush(base.DataGridTableStyle.BackColor);
87.                 //Brush foreBrush    = new SolidBrush(base.DataGridTableStyle.ForeColor);
88.                 Rectangle rect = bounds;
89.                 StringFormat format   = new StringFormat();
90.                 if(alignToRight)
91.                 {
92.                     format.FormatFlags = StringFormatFlags.LineLimit;
93.                     format.Trimming = StringTrimming.EllipsisPath;
94.                 }
95.                 else
96.                 {
97.                     format.FormatFlags = StringFormatFlags.LineLimit;
98.                     format.Trimming = StringTrimming.EllipsisCharacter;
99.                 }
100.                 
101.                 g.DrawString(text,this.DataGridTableStyle.DataGrid.Font, foreBrush, rect, format);
102.                 format.Dispose();
103.             }
104.             else
105.             {
106.                 base.Paint (g, bounds, source, rowNum, backBrush, foreBrush, alignToRight);
107.             }
108.         }
109.     }
110. }