C#委托和窗体之间的方法调用

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp2
{

public partial class Form1 : Form
{

public UpImageDelegate UpImageDelegate = null;

public static Form1 form1;
public Form1()
{
InitializeComponent();
form1 = this;
}

private void button1_Click(object sender, EventArgs e)
{

}
public void method()
{
button1.Text = UpImageDelegate("节点1：");
}

private void button2_Click(object sender, EventArgs e)
{
Form2 technology = new Form2();
technology.ShowDialog();
}
}
}

//////////////////////////////////////////////////////////////////////////////////////////////////

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp2
{
public partial class Form2 : Form
{

public Form2()
{
InitializeComponent();
}

public string UPImage(string s)
{

return s + "数据1";
}
private void label1_Click(object sender, EventArgs e)
{

Form1.form1. UpImageDelegate = UPImage;
Form1.form1.method();
this.Close();

}
}
}