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HelloWorld/App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
+    </startup>
+</configuration>

HelloWorld/Form1.Designer.cs

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+namespace HelloWorld
+{
+    partial class Hello_World
+    {
+        /// <summary>
+        /// 必需的设计器变量。
+        /// </summary>
+        private System.ComponentModel.IContainer components = null;
+
+        /// <summary>
+        /// 清理所有正在使用的资源。
+        /// </summary>
+        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
+        protected override void Dispose(bool disposing)
+        {
+            if (disposing && (components != null))
+            {
+                components.Dispose();
+            }
+            base.Dispose(disposing);
+        }
+
+        #region Windows 窗体设计器生成的代码
+
+        /// <summary>
+        /// 设计器支持所需的方法 - 不要修改
+        /// 使用代码编辑器修改此方法的内容。
+        /// </summary>
+        private void InitializeComponent()
+        {
+            this.button1 = new System.Windows.Forms.Button();
+            this.SuspendLayout();
+            // 
+            // button1
+            // 
+            this.button1.Font = new System.Drawing.Font("宋体", 48F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
+            this.button1.Location = new System.Drawing.Point(236, 156);
+            this.button1.Name = "button1";
+            this.button1.Size = new System.Drawing.Size(591, 426);
+            this.button1.TabIndex = 0;
+            this.button1.Text = "say";
+            this.button1.UseVisualStyleBackColor = true;
+            this.button1.Click += new System.EventHandler(this.button1_Click);
+            // 
+            // Hello_World
+            // 
+            this.AutoScaleDimensions = new System.Drawing.SizeF(9F, 18F);
+            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
+            this.ClientSize = new System.Drawing.Size(1054, 769);
+            this.Controls.Add(this.button1);
+            this.Cursor = System.Windows.Forms.Cursors.Cross;
+            this.Name = "Hello_World";
+            this.Text = "Hello World";
+            this.Load += new System.EventHandler(this.Form1_Load);
+            this.ResumeLayout(false);
+
+        }
+
+        #endregion
+
+        private System.Windows.Forms.Button button1;
+    }
+}
+

HelloWorld/Form1.cs

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+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 HelloWorld
+{
+    public partial class Hello_World : Form
+    {
+        public Hello_World()
+        {
+            InitializeComponent();
+        }
+
+        private void button1_Click(object sender, EventArgs e)
+        {
+            MessageBox.Show("Hello World");
+        }
+
+        private void Form1_Load(object sender, EventArgs e)
+        {
+
+        }
+    }
+}