問題描述
Web 窗體用戶控制事件，需要在頁面加載後添加 (Web Form User Control Event, needs to be added after page loads)
我的應用程序包含一個 Web 表單，有人可能會在其中提取一些信息。發生這種情況時，我會根據內容多次加載一個用戶控件，該控件上有一個 ImageButton。
由於這是在頁面加載後加載的，我怎樣才能讓點擊事件正常工作。由於頁面加載期間需要設置點擊事件。
示例場景：
Main.aspx
強><form id="form1" runat="server">
<div>
<asp:Button ID="clicker" runat="server" Text="Click Me" />
<asp:PlaceHolder ID="PHwfuc" runat="server"></asp:PlaceHolder>
<asp:Label runat="server" ID="ResponseMessage"></asp:Label>
</div>
</form>
Main.aspx.cs
protected void Page_Load(object sender, EventArgs e)
{
clicker.Click += new EventHandler(this.ButClick);
}
protected void ButClick(object sender, EventArgs e)
{
PlaceHolder placeHolder = new PlaceHolder();
for (int i = 0; i < 2; i++)
{
WFUC1 test = LoadControl("~/WebFormUserControl/WFUC1.ascx") as WFUC1;
test.Ident = i;
placeHolder.Controls.Add(test);
}
PHwfuc.Controls.Add(placeHolder);
}
WFUC1.ascx
<asp:PlaceHolder runat="server" ID="DelAddrBtn"></asp:PlaceHolder>
<asp:Label runat="server" ID="ResponseMessage"></asp:Label>
<br />
WFUC1.ascx.cs
public WFUC1()
{
TrashIcon = new ImageButton
{
AlternateText = "Delete Address",
ImageUrl = "/images/trash.png",
ToolTip = "Delete Address",
};
TrashIcon.Style.Add("cursor", "pointer");
TrashIcon.Style.Add("width", "24px");
}
private ImageButton TrashIcon { get; set; }
public int Ident { get; set; }
protected void Page_Load(object sender, EventArgs e)
{
TrashIcon.ID = $"Delete_{Ident}";
TrashIcon.Click += new ImageClickEventHandler(this.TrashIcon_Click);
DelAddrBtn.Controls.Add(TrashIcon);
}
protected void TrashIcon_Click(object sender, ImageClickEventArgs e)
{
ResponseMessage.Text = $"Use Control Got it. {Ident}";
}
為 Rango 編輯<
參考解法
方法 1:
Seems, I have to reload all the controls on the main again to get the click event to execute. I accidentally made this work.
Below Project Visual Studio 2017 ‑ No binaries, except for one image and the rest is only project code.
Main.aspx
<form id="form1" runat="server">
<asp:Button ID="clicker" runat="server" Text="Click Me" />
<asp:PlaceHolder ID="PHwfuc" runat="server"></asp:PlaceHolder>
<asp:Label runat="server" ID="ResponseMessage"></asp:Label>
</form>
Main.aspx.cs
protected void Page_Load(object sender, EventArgs e)
{
clicker.Click += new EventHandler(this.ButClick);
if(ViewState["ButClick"] != null)
LoadData();
}
protected void ButClick(object sender, EventArgs e)
{
LoadData();
}
private void LoadData()
{
PlaceHolder placeHolder = new PlaceHolder();
for (int i = 0; i < 2; i++)
{
WFUC1 test = LoadControl("~/WebFormUserControl/WFUC1.ascx") as WFUC1;
test.Ident = i;
placeHolder.Controls.Add(test);
}
PHwfuc.Controls.Add(placeHolder);
ViewState["ButClick"] = true;
}
WFUC1.ascx
<asp:ImageButton runat="server" ID="TrashIcon" ImageUrl = "/images/trash.png" ToolTip = "Delete Address" OnClick="TrashIcon_Click" />
<br />
<asp:Label runat="server" ID="ResponseMessage"></asp:Label>
WFUC1.ascx
public int Ident { get; set; }
public void TrashIcon_Click(object sender, ImageClickEventArgs e)
{
ResponseMessage.Text = $"Use Control Got it. {Ident}";
}