C# 程序兼容同一个dll的不同版本

当程序多个dll引用同一个dll的不同版本时，程序启动会报错，此时需要在启动程序集的App.config下增加以下配置

以log4为例子

<configuration>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
    </startup>
    <runtime>
        <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
            <dependentAssembly>
                <assemblyIdentity name="log4net" publicKeyToken="669e0ddf0bb1aa2a" culture="neutral" />
                <bindingRedirect oldVersion="0.0.0.0-2.0.8.0" newVersion="2.0.8.0" />
            </dependentAssembly>
        </assemblyBinding>
    </runtime>
</configuration>

<dependentAssembly>
<assemblyIdentity name="log4net" publicKeyToken="669e0ddf0bb1aa2a" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-2.0.8.0" newVersion="2.0.8.0" />
</dependentAssembly>