App.config Examples

Below are three examples of useful application configuration files.

  1. Forces the v1.0 CLR to be run. If the v1.0 CLR is not installed, the app will fail to run.

    <?xml version ="1.0"?>
    <configuration>
    <startup>
    <requiredRuntime version="v1.0.3705"/>
    <supportedRuntime version="v1.0.3705"/>
    </startup>
    </configuration>

  2. Redirects “assemblyName, Version=1.0.0.0, Culture=neutral, PublicKeyToken=25283151a234958d“ to version 2.0.0.0 of that assembly. This is only useful for strongly-named assemblies, since versions don't matter for those that are simply-named.

    <?xml version ="1.0"?>
    <configuration>
    <runtime>

            <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">

                    <dependentAssembly>
    <assemblyIdentity name="assemblyName" culture="" publicKeyToken="25283151a234958d"/>
    <bindingRedirect oldVersion="1.0.0.0" newVersion="2.0.0.0"/>

                    </dependentAssembly>
    </assemblyBinding>

    </runtime>
    </configuration>

  3. Redirects “assemblyName, Version=1.0.0.0, Culture=neutral, PublicKeyToken=8968ee41e78ce97a“ to codebase “http://www.yourwebsite.com/filename.dll“. 'Href' can also be set to something like “file:///c:/localfile/filename.dll“. Note that redirecting to a codebase causes a System.Net.WebPermission or System.IO.FileIOPermissionAccess.Read + PathDiscovery demand when loading that assembly.

    <?xml version ="1.0"?>
    <configuration>
    <runtime>

            <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">

                    <dependentAssembly>
    <assemblyIdentity name="assemblyName" culture="" publicKeyToken="8968ee41e78ce97a"/>
    <codeBase version="1.0.0.0" href="http://www.yourwebsite.com/filename.dll"/>

                    </dependentAssembly>
    </assemblyBinding>

    </runtime>
    </configuration>