此名称'_form1'在当前上下文中不存在

Question

namespace WindowsApplication

public partial class Form1: Form
{
    public Form1()
    {
        InitializeComponent();
        _Form1 = this;
    }    
}

错误：当前上下文中不存在名称“_Form1”

Answer 1

你忘了申报_Form1：

Form1 _Form1;
_Form1 = this;