【发布时间】：2021-05-30 03:56:28
【问题描述】：
我有以下类，它是用于创建 gridview 动态的类：
public class DynamicGridViewImageButtonTemplate : ITemplate
{
string _ColName;
DataControlRowType _rowType;
int _Count;
int _Kind;
public DynamicGridViewImageButtonTemplate(string ColName, DataControlRowType RowType, int Kind)
{
_ColName = ColName;
_rowType = RowType;
_Kind = Kind;
}
public void InstantiateIn(System.Web.UI.Control container)
{
switch (_rowType)
{
case DataControlRowType.DataRow:
if (_Kind == 0)
{
Label lbl = new Label();
lbl.DataBinding += new EventHandler(this.lbl_DataBind);
container.Controls.Add(lbl);
}
else
if (_Kind == 1)
{
ImageButton vImageButton = new ImageButton();
vImageButton.ID = "btnGetVoucher";
vImageButton.CommandArgument = string.Format("<%# Eval({0}) %>", "Voucher");
vImageButton.CssClass = "divButton";
vImageButton.Height = 25;
vImageButton.Width = 25;
vImageButton.Command += new CommandEventHandler(btnGetVoucher_Command);
vImageButton.DataBinding += new EventHandler(this.imgBtn_DataBind);
container.Controls.Add(vImageButton);
}
break;
default:
break;
}
}
以及以下用于将方法运行时分配给我在列中创建的图像按钮的 c# 代码：
protected void btnGetVoucher_Command(object sender, CommandEventArgs e)
{
ImageButton btn = sender as ImageButton;
}
protected void gridview_RowCreated(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
ImageButton vImageButton = (ImageButton)e.Row.FindControl("btnGetVoucher");
vImageButton.Command += new CommandEventHandler(btnGetVoucher_Command);
}
}
gridcolumn的创建如下：
GridView vGridView = new GridView();
vGridView.RowCreated += new GridViewRowEventHandler(gridview_RowCreated);
vTemplateField = new TemplateField();
vTemplateField.HeaderTemplate = new DynamicGridViewImageButtonTemplate("Voucher", DataControlRowType.Header, 0);
vTemplateField.ItemTemplate = new DynamicGridViewImageButtonTemplate("Voucher", DataControlRowType.DataRow, 1);
vGridView.Columns.Add(vTemplateField);
最后是这里的数据绑定：
private void imgBtn_DataBind(Object sender, EventArgs e)
{
ImageButton btn = (ImageButton)sender;
GridViewRow row = (GridViewRow)btn.NamingContainer;
btn.CommandArgument = DataBinder.Eval(row.DataItem, "Voucher").ToString();
}
但我无法进入方法btnGetVoucher_Command :-( 我认为一切都已正确 - 但一定有什么地方我错过了......
我可以在我的 Row_Created 例程中访问该按钮 - 但之后不使用 GetVoucherCommand :-( 事件未触发 :-(
所以我的问题是为什么我不能进入那个例程？
提前致谢， 迈克尔
更新： 全班都在这里...
public class DynamicGridViewTextTemplate : ITemplate
{
string _ColNameText;
DataControlRowType _rowType;
public DynamicGridViewTextTemplate(string ColNameText, DataControlRowType RowType)
{
_ColNameText = ColNameText;
_rowType = RowType;
}
public void InstantiateIn(System.Web.UI.Control container)
{
switch (_rowType)
{
case DataControlRowType.Header:
Literal lc = new Literal();
lc.Text = "<b>" + _ColNameText + "</b>";
container.Controls.Add(lc);
break;
case DataControlRowType.DataRow:
ImageButton vImageButton = new ImageButton();
vImageButton.ID = "btnGetVoucher";
vImageButton.ImageUrl = "~/Images/Icons/icons8-download-from-the-cloud-50.png";
vImageButton.PostBackUrl = "#DownloadVoucher";
vImageButton.CommandArgument = string.Format("<%# Eval({0}) %>", "Voucher");
vImageButton.ToolTip = "Se og download bilag";
vImageButton.CssClass = "divButton";
vImageButton.Height = 25;
vImageButton.Width = 25;
vImageButton.DataBinding += new EventHandler(this.imgBtn_DataBind);
vImageButton.CommandName = "DownloadVoucher";
vImageButton.Command += new CommandEventHandler(btnGetVoucher_Command);
container.Controls.Add(vImageButton);
break;
default:
break;
}
}
private void imgBtn_DataBind(Object sender, EventArgs e)
{
ImageButton btn = (ImageButton)sender;
GridViewRow row = (GridViewRow)btn.NamingContainer;
btn.CommandArgument = DataBinder.Eval(row.DataItem, _ColNameText).ToString();
}
}
public class DynamicGridViewImageButtonTemplate : ITemplate
{
string _ColNameText;
DataControlRowType _rowType;
public DynamicGridViewImageButtonTemplate(string ColNameText, DataControlRowType RowType)
{
_ColNameText = ColNameText;
_rowType = RowType;
}
public void InstantiateIn(System.Web.UI.Control container)
{
switch (_rowType)
{
case DataControlRowType.Header:
Literal lc = new Literal();
lc.Text = "<b>" + _ColNameText + "</b>";
container.Controls.Add(lc);
break;
case DataControlRowType.DataRow:
ImageButton vImageButton = new ImageButton();
vImageButton.ID = "btnGetVoucher";
vImageButton.ImageUrl = "~/Images/Icons/icons8-download-from-the-cloud-50.png";
vImageButton.PostBackUrl = "#DownloadVoucher";
vImageButton.CommandArgument = string.Format("<%# Eval({0}) %>", "Voucher");
vImageButton.ToolTip = "Se og download bilag";
vImageButton.CssClass = "divButton";
vImageButton.Height = 25;
vImageButton.Width = 25;
vImageButton.DataBinding += new EventHandler(this.imgBtn_DataBind);
vImageButton.CommandName = "DownloadVoucher";
vImageButton.Command += new CommandEventHandler(btnGetVoucher_Command);
container.Controls.Add(vImageButton);
break;
default:
break;
}
}
protected void btnGetVoucher_Command(object sender, CommandEventArgs e)
{
ImageButton btn = sender as ImageButton;
}
private void imgBtn_DataBind(Object sender, EventArgs e)
{
ImageButton btn = (ImageButton)sender;
GridViewRow row = (GridViewRow)btn.NamingContainer;
btn.CommandArgument = DataBinder.Eval(row.DataItem, _ColNameText).ToString();
}
}
活动在这里...
protected void gridview_RowCreated(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
ImageButton vImageButton = (ImageButton)e.Row.FindControl("btnGetVoucher");
}
}
protected void gridview_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
ImageButton vImageButton = (ImageButton)e.Row.FindControl("btnGetVoucher");
}
}
protected void gridview_RowCommand(object sender, CommandEventArgs e)
{
if (e.CommandName == "DownloadVoucher")
{
int index = Convert.ToInt32(e.CommandArgument);
GridView grid = sender as GridView;
GridViewRow row = grid.Rows[index];
ImageButton vImageButton = (ImageButton)row.FindControl("btnGetVoucher");
}
}
gridview的创建就到这里了……
GridView vGridView = new GridView();
vGridView.AutoGenerateColumns = false;
vGridView.ShowHeaderWhenEmpty = true;
vGridView.ShowHeader = true;
vGridView.HeaderStyle.BackColor = System.Drawing.ColorTranslator.FromHtml("#C6E0B4");
vGridView.HeaderStyle.HorizontalAlign = HorizontalAlign.Left;
vGridView.RowCreated += new GridViewRowEventHandler(gridview_RowCreated);
vGridView.RowDataBound += new GridViewRowEventHandler(gridview_RowDataBound);
vGridView.RowCommand += new GridViewCommandEventHandler(gridview_RowCommand);
vTemplateField = new TemplateField();
vTemplateField.HeaderTemplate = new DynamicGridViewImageButtonTemplate("Voucher", DataControlRowType.Header);
vTemplateField.ItemTemplate = new DynamicGridViewImageButtonTemplate("Voucher", DataControlRowType.DataRow);
vGridView.Columns.Add(vTemplateField);
【问题讨论】：