为什么将“EventArgs”的参数更改为“FormClosingEventArgs”时出现错误

Question

在 Program.cs 中，Argument EventArgs更改为FormClosingEventArgs

private void Exit_Click(object sender, FormClosingEventArgs e) {   }

在Program.Designer.cs，变化的Program.cs导致在Line.9错误

    private void InitializeComponent()
    {
        this.Exit = new System.Windows.Forms.Button();
        this.SuspendLayout();
        this.Exit.Location = new System.Drawing.Point(839, 275);
        this.Exit.Name = "Exit";
        this.Exit.Size = new System.Drawing.Size(169, 112);
        this.Exit.TabIndex = 0;
        this.Exit.Text = "Exit";
        this.Exit.UseVisualStyleBackColor = true;
        this.Exit.Click += new System.EventHandler(this.Exit_Click);     //ErrorPart
        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.ClientSize = new System.Drawing.Size(1020, 399);
        this.Controls.Add(this.Exit);
        this.Name = "Form1";
        this.Text = "Form1";
        this.ResumeLayout(false);
    }

Exisi 错误 CS0123：“Exit_Click”没有重载匹配委托“EventHandler”。

每次我开始调试时都会向我显示，我使用的是 Visual Studio 2017，那边有什么问题......？

Answer 1

这是因为System.Windows.Forms.Control的Click处理程序不采用FormClosingEventArgs类型的FormClosingEventArgs ，而是采用需要像这样传递的EventArgs

private void Exit_Click(object sender, EventArgs e) {   }

简单来说，这就像将一个string值分配给一个int变量

有关更多信息，请参阅此 - https://msdn.microsoft.com/en-us/library/system.windows.forms.control.click(v=vs.110).aspx