为什么我得到错误“类型‘字符串’必须是一个不可为空的值类型,以便将它用作泛型类型或方法‘System.Nullable’中的参数'T‘”?
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using Universe;
namespace Universe
{
public class clsdictionary
{
private string? m_Word = "";
private string? m_Meaning = "";
string? Word {
get { return m_Word; }
set { m_Word = value; }
}
string? Meaning {
get { return m_Meaning; }
set { m_Meaning = value; }
}
}
}
https://stackoverflow.com/questions/9236468
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