我创建了一个显示动画图像的自定义DataGridView单元格和列。它非常简单并且工作正常,只是它从DGV抛出一个“DataError”事件: “单元格的格式化值类型错误”
我已从我的两个自定义类中删除了所有代码,但我仍然收到此错误。我已经检查过继承的DGV单元是从它的基础DataGridViewImageCell中提取正确的FormatedValueType。
抛出(并捕获)的异常包含NO stacktrace,因此我无法确定抛出它的方法。
我把一个很小的(< 100行)示例放在一起,说明了这个错误。我希望有人可以为我揭开这一点。我以前创建过其他自定义Cell / Column类型,但它们一直都是基于System.String的,我从来没有抛出这个特定的错误。
以下是代码:
using System;
using System.Windows.Forms;
namespace TestBench
{
static class Program
{
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new BestFormEver());
}
}
public class BestFormEver : Form
{
public BestFormEver()
{
InitializeComponent();
dataGridView1.Rows.Add(2);
}
protected override void Dispose(bool disposing)
{
base.Dispose(disposing);
}
private void InitializeComponent()
{
this.dataGridView1 = new System.Windows.Forms.DataGridView();
this.Column1 = new PMD.Library.WinFormControls.Controls.DataGridView.ImageColumn.PMDDataGridViewImageColumn();
((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).BeginInit();
this.SuspendLayout();
this.dataGridView1.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
| System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.dataGridView1.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
this.dataGridView1.Columns.AddRange(new System.Windows.Forms.DataGridViewColumn[] {
this.Column1});
this.dataGridView1.Location = new System.Drawing.Point(25, 24);
this.dataGridView1.Name = "dataGridView1";
this.dataGridView1.Size = new System.Drawing.Size(454, 206);
this.dataGridView1.TabIndex = 0;
this.Column1.HeaderText = "Column1";
this.Column1.Name = "Column1";
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(508, 259);
this.Controls.Add(this.dataGridView1);
this.Name = "BestFormEver";
this.Text = "BestFormEver";
((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).EndInit();
this.ResumeLayout(false);
}
private System.Windows.Forms.DataGridView dataGridView1;
private PMD.Library.WinFormControls.Controls.DataGridView.ImageColumn.PMDDataGridViewImageColumn Column1;
}
public class PMDDataGridViewImageColumn : DataGridViewColumn
{
public PMDDataGridViewImageColumn() : base(new PMDDataGridViewImageCell())
{
}
}
class PMDDataGridViewImageCell : DataGridViewImageCell
{
public PMDDataGridViewImageCell()
{
}
}
}
答案 0 :(得分:2)
您需要覆盖PMDDataGridViewImageCell类中的GetFormattedValue()方法,并让它返回一个值(任何值都可以,甚至为null)。
使用您的示例,我添加了一个返回SystemIcons.Question的覆盖 - 现在异常消失了,图标在网格中正确显示。
希望这有帮助。