


Solving the Mysterious System.MissingMethodException in ASP.NET WebForms
The dreaded System.MissingMethodException
can be a frustrating roadblock in .NET development, especially when the missing method clearly exists within the same class. This often happens in ASP.NET WebForms applications, leaving developers scratching their heads.
Let's examine a scenario where the DoThis
method, seemingly present in the MyHandler
class, inexplicably triggers this exception:
public class MyHandler : IHttpHandler { public void ProcessRequest(HttpContext context) { // Throws System.MissingMethodException: Method not found. this.DoThis(); } public void DoThis() { ... } }
The Culprit: Conflicting Assemblies
The root cause frequently lies in lingering, outdated assemblies. An older version of the DLL, lurking somewhere in your deployment path, can create a conflict, causing the runtime to load the incorrect version and thus fail to find the expected method.
The Solution: A Clean Rebuild and Redeployment
To resolve this issue, a thorough cleanup is necessary:
-
Completely remove all build artifacts: Delete the
bin
andobj
folders within your project and solution directories. This ensures no remnants of previous builds interfere. -
Rebuild the entire solution: A fresh build guarantees that the latest code is compiled and packaged correctly.
-
Redeploy the application: This step ensures that the updated assemblies completely replace the outdated ones on the server. Pay close attention to your deployment process to ensure a clean overwrite of the files.
By following these steps, you effectively eliminate the lingering effects of old assemblies, allowing your WebForms application to function correctly and avoid the System.MissingMethodException
.
The above is the detailed content of Why Does My ASP.NET WebForms Application Throw a System.MissingMethodException, Even Though the Method Exists?. For more information, please follow other related articles on the PHP Chinese website!

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