.|vb=.|cpp=::|nu=.|fs=.");</script>String</a><br /></dd><dt><span class="parameter">mchKey</span></dt><dd>类型：<a href="https://docs.microsoft.com/dotnet/api/system.string" target="_blank">System<span id="LSTDA67CD59_2"></span><script type="text/javascript">AddLanguageSpecificTextSet("LSTDA67CD59_2?cs=.|vb=.|cpp=::|nu=.|fs=.");</script>String</a><br /></dd></dl><h4 class="subHeading">返回值</h4>类型：<a href="https://docs.microsoft.com/dotnet/api/system.string" target="_blank">String</a></div><div