请考虑使用 app.config 将程序集“System.Data, Culture=neutral, PublicKeyToken=969db8053d3322ac, Retargetable=Yes”从版本“2.0.0.0”[]重新映射

做mobile开发编译输出提示：

请考虑使用 app.config 将程序集“System.Data, Culture=neutral, PublicKeyToken=969db8053d3322ac, Retargetable=Yes”从版本“2.0.0.0”[]重新映射到版本“3.5.0.0”

只需在项目中加入 App.Config 文件，文件内容如下即可：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <runtime>
        <assemblyBinding>
            <dependentAssembly>
                <assemblyIdentity name= "System.Data" culture= "neutral" publicKeyToken= "969db8053d3322ac" Retargetable= "Yes"/>
                <bindingRedirect oldVersion= "2.0.0.0" newVersion= "3.5.0.0"/>
            </dependentAssembly>
            <dependentAssembly>
                <assemblyIdentity name= "System" culture= "neutral" publicKeyToken="969db8053d3322ac" Retargetable= "Yes"/>
                <bindingRedirect oldVersion= "2.0.0.0" newVersion= "3.5.0.0" />
            </dependentAssembly>
            <dependentAssembly>
                <assemblyIdentity name= "System.Xml" culture= "neutral" publicKeyToken="969db8053d3322ac" Retargetable= "Yes"/>
                <bindingRedirect oldVersion= "2.0.0.0" newVersion= "3.5.0.0" />
            </dependentAssembly>
        </assemblyBinding>
    </runtime>
</configuration>

个人猜测，可能是运行时检测到安装有多个版本，推荐用新的版本运行.