1.调试信息中显示UTF-8字符串：

    C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\Packages\Debugger\Visualizers\stl.natvis

    <Intrinsic Name="size" Expression="_Mypair._Myval2._Mysize" />
    <Intrinsic Name="capacity" Expression="_Mypair._Myval2._Myres" />
    <DisplayString Condition="capacity() &lt; _Mypair._Myval2._BUF_SIZE">{_Mypair._Myval2._Bx._Buf,s8}</DisplayString>
    <DisplayString Condition="capacity() &gt;= _Mypair._Myval2._BUF_SIZE">{_Mypair._Myval2._Bx._Ptr,s8}</DisplayString>
    <StringView Condition="capacity() &lt; _Mypair._Myval2._BUF_SIZE">_Mypair._Myval2._Bx._Buf,na</StringView>
    <StringView Condition="capacity() &gt;= _Mypair._Myval2._BUF_SIZE">_Mypair._Myval2._Bx._Ptr,na</StringView>