经过测试，我发现Dapper确实支持从存储过程中提取XML。

After testing, I see that Dapper does indeed support pulling the XML from stored procedures.

var result = conn.Query<string>(@"select * from <someTable> for xml auto");

这将返回一个字符串数组，每个元素最多包含2,033个字符，您可以简单地加入

This will return an array of string with each element containing up to 2,033 characters, which you can simple join to have your result as a single string.

var fullResult = string.Join("", result);

或

var fullResult = string.Concat(result);

或全部一步：

var result = string.Concat(conn.Query<string>(
    @"select * from <someTable> for xml auto", buffered: false));

因此，我不需要自己实现ExcuteXmlReader方法，现在我可以让Dapper处理参数通常。

So, there is no need for me to implement ExcuteXmlReader method myself, and now I can let Dapper handle the parameters normally.