extnet
ASP.NET's Page_Error() handling is odd when clearing errors
If Page_Error() clears the error message and tries to provide tailored server response, the response received by Ext.NET is always a blank json object {} and any Response.Write() or X.AddScript() call is ignored.
Found: 4.2.0 Ext.NET forum thread: General exception handling pop up
Test cases will follow.
This is a failing test case. The returned response is always an empty json object (must open browser debug tools and watch network traffic/response after clicking the button in the example.
<%@ Page Language="C#" %>
<!DOCTYPE html>
<script runat="server">
protected void Test_ButtonOnDirectClick(object sender, DirectEventArgs e)
{
throw new Exception("My Exception");
}
public void Page_Error(object sender, EventArgs e)
{
Exception exc = Server.GetLastError();
X.Msg.Alert("Error", "Server side error: " + exc.Message);
Server.ClearError();
}
</script>
<html>
<head id="Head1" runat="server">
<title>Default Exception Handling</title>
</head>
<body>
<form id="Form1" runat="server">
<h1>Default Button</h1>
<ext:ResourceManager ID="ResourceManager1" runat="server" />
<ext:Container ID="Container1"
runat="server"
Layout="VBoxLayout"
Height="650">
<Items>
<ext:Button ID="btnSalvar"
runat="server"
Width="100"
Height="100"
Text="test"
Icon="Disk"
>
<DirectEvents>
<Click OnEvent="Test_ButtonOnDirectClick" />
</DirectEvents>
</ext:Button>
</Items>
</ext:Container>
</form>
</body>
</html>
The following example is a pure ASP.NET which response is normally manipulated after a Server.ClearError() call:
<%@ Page Language="C#" %>
<script runat="server">
protected void Submit_Click(object sender, EventArgs e)
{
// Exception handled by Page_Error
throw new Exception("MyException");
}
private void Page_Error(object sender, EventArgs e)
{
// Get last error from the server
Exception exc = Server.GetLastError();
Response.Write("<h2>Default Page Error</h2>\n");
Response.Write("<p>Server error: " + exc.Message + "</p>\n");
// Clear the error from the server
Server.ClearError();
}
</script>
<!DOCTYPE html>
<html>
<head id="Head1" runat="server">
<title>Exception Handler Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h2>Default Page</h2>
<p>
Click this button to throw an exception to be handled by Page_Error().<br />
<asp:Button
ID="Submit1"
runat="server"
OnClick="Submit_Click"
Text="test"
/>
</p>
</div>
</form>
</body>
</html>
Of course, with Ext.NET the response is handled differently, as it expects a script to be run/interpreted, but the X.AddScript() method shouldn't be ignored/cleared either.