TemplateControl.OnError(EventArgs) 方法
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
引發 Error 事件。
protected:
virtual void OnError(EventArgs ^ e);protected virtual void OnError (EventArgs e);abstract member OnError : EventArgs -> unit
override this.OnError : EventArgs -> unitProtected Overridable Sub OnError (e As EventArgs)參數
範例
下列程式碼範例示範使用 OnError 方法的可能方式。 它會建立字串，其中包含一些不正確引數，這會導致例外狀況。 因為類別 TemplateControl 是抽象類別，所以此程式碼範例是使用 Page 衍生自 類別的 TemplateControl 類別所撰寫。
<%@ Page language="VB" %>
<html>
<head>
<script language="VB" runat="server">
Sub Page_Load(sender as object, e as System.EventArgs)
AddHandler Page.Error, AddressOf Error_Handler
try
Dim myString as string = "Hello"
'An exception is raised because the length of 'myString' is less than '6'.
Dim mySubString as string= myString.Substring(0,6)
catch e1 As Exception
OnError (EventArgs.Empty)
End try
End Sub
Sub Error_Handler(sender as object,e as System.EventArgs)
Response.Write("<br><b>An Error was raised</b>")
End Sub
</script>
</head>
</html>
<%@ Page language="c#" %>
<html>
<head>
<script language="C#" runat="server">
void Page_Load(object sender, System.EventArgs e)
{
Page.Error += new System.EventHandler(Error_Handler);
try
{
string myString = "Hello";
// An exception is raised because the length of 'myString' is less than '6'.
string mySubString = myString.Substring(0,6);
}
catch(Exception)
{
OnError(EventArgs.Empty);
}
}
void Error_Handler(object sender,System.EventArgs e)
{
Response.Write("<br><b>An Error was raised</b>");
}
</script>
</head>
</html>
