C# 线程中操作窗体控件

Posted 2021-04-03 dotNET编程大全

1. 在线程中给textBox1

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;
using System.Threading;
namespace WindowsFormsApp12{ public partial class Form1 : Form {  public Form1() { InitializeComponent(); }
 private void Form1_Load(object sender, EventArgs e) {
 // CheckForIllegalCrossThreadCalls = false; // Class1 cs1 = new Class1(); Thread th = new Thread(test1); th.Start(); // cs1.ShowEvent = test;
 }
 public void test1() {
 // ShowlbDevTem("123"); textBox1.Text = "123";
 }

 private void button1_Click(object sender, EventArgs e) {
 // ShowlbDevTem("112");
 }
 /* public void test(string str) {
 ShowlbDevTem(str); }  public delegate void SWTDelegate(string AddStr); //public delegate void ComsumerTextDelegate(int Index, string AddStr); public void ShowlbDevTem(string AddStr) { if (textBox1.InvokeRequired) { SWTDelegate pd = new SWTDelegate(ShowlbDevTem); textBox1.Invoke(pd, new object[] { AddStr }); } else { textBox1.Text = AddStr; //richTextBox1.AppendText(AddStr); } }
 public void dataShow(int row, int column, string str) { row = row % 30; ShowMessage(dataGridViewX1, str, row, column);
 }

 delegate void ShowMessageDelegate(DataGridView dg, string message, int row, int column); private void ShowMessage(DataGridView dg, string message, int row, int column) { if (dg.InvokeRequired) { ShowMessageDelegate showMessageDelegate = ShowMessage; dg.Invoke(showMessageDelegate, new object[] { dg, message, row, column }); } else {
 dg.Rows[row].Cells[column].Value = message; } } */

 }}

运行结果：

线程中是不允许直接操作窗体空间的

怎么解决呢？

方法1： CheckForIllegalCrossThreadCalls = false;

运行ok

方法2：委托实现：

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;
using System.Threading;
namespace WindowsFormsApp12{ public partial class Form1 : Form {  public Form1() { InitializeComponent(); }
 private void Form1_Load(object sender, EventArgs e) {
 //CheckForIllegalCrossThreadCalls = false; // Class1 cs1 = new Class1(); Thread th = new Thread(test1); th.Start(); // cs1.ShowEvent = test;
 }
 public void test1() {
 ShowlbDevTem("123"); //textBox1.Text = "123";
 }

 private void button1_Click(object sender, EventArgs e) {
 // ShowlbDevTem("112");
 }
 /* public void test(string str) {
 ShowlbDevTem(str); }*/  public delegate void SWTDelegate(string AddStr); //public delegate void ComsumerTextDelegate(int Index, string AddStr); public void ShowlbDevTem(string AddStr) { if (textBox1.InvokeRequired) { SWTDelegate pd = new SWTDelegate(ShowlbDevTem); textBox1.Invoke(pd, new object[] { AddStr }); } else { textBox1.Text = AddStr; //richTextBox1.AppendText(AddStr); } }
 /* public void dataShow(int row, int column, string str) { row = row % 30; ShowMessage(dataGridViewX1, str, row, column);
 }

 delegate void ShowMessageDelegate(DataGridView dg, string message, int row, int column); private void ShowMessage(DataGridView dg, string message, int row, int column) { if (dg.InvokeRequired) { ShowMessageDelegate showMessageDelegate = ShowMessage; dg.Invoke(showMessageDelegate, new object[] { dg, message, row, column }); } else {
 dg.Rows[row].Cells[column].Value = message; } } */

 }}

然后我想在类中对空间进行操作，这样还可以么？

试试看

主窗体代码：

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;
using System.Threading;
namespace WindowsFormsApp12{ public partial class Form1 : Form {  public Form1() { InitializeComponent(); }
 private void Form1_Load(object sender, EventArgs e) {
 //CheckForIllegalCrossThreadCalls = false; Class1 cs1 = new Class1(); Thread th = new Thread(cs1.test); th.Start(); // cs1.ShowEvent = test;
 }
 public void test1() {
 ShowlbDevTem("123"); //textBox1.Text = "123";
 }

 private void button1_Click(object sender, EventArgs e) {
 // ShowlbDevTem("112");
 }
 /* public void test(string str) {
 ShowlbDevTem(str); }*/  public delegate void SWTDelegate(string AddStr); //public delegate void ComsumerTextDelegate(int Index, string AddStr); public void ShowlbDevTem(string AddStr) { if (textBox1.InvokeRequired) { SWTDelegate pd = new SWTDelegate(ShowlbDevTem); textBox1.Invoke(pd, new object[] { AddStr }); } else { textBox1.Text = AddStr; //richTextBox1.AppendText(AddStr); } }
 /* public void dataShow(int row, int column, string str) { row = row % 30; ShowMessage(dataGridViewX1, str, row, column);
 }

 delegate void ShowMessageDelegate(DataGridView dg, string message, int row, int column); private void ShowMessage(DataGridView dg, string message, int row, int column) { if (dg.InvokeRequired) { ShowMessageDelegate showMessageDelegate = ShowMessage; dg.Invoke(showMessageDelegate, new object[] { dg, message, row, column }); } else {
 dg.Rows[row].Cells[column].Value = message; } } */

 }}

class1中代码：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;
using System.Threading;using System.Windows.Forms;
namespace WindowsFormsApp12{ class Class1 { //public Action<string> ShowEvent; public void test() {
 //ShowEvent("123456789");
 Form1 f1 = new Form1(); f1.ShowlbDevTem("112");

 } 
  }}

运行结果：

哎呦，卧槽

运行不报错 但是文本框中是空的，怎么办？

主窗体：

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;
using System.Threading;
namespace WindowsFormsApp12{ public partial class Form1 : Form {  public Form1() { InitializeComponent(); }
 private void Form1_Load(object sender, EventArgs e) {
 //CheckForIllegalCrossThreadCalls = false; Class1 cs1 = new Class1(); Thread th = new Thread(cs1.test); th.Start(); cs1.ShowEvent = test;
 }
 public void test1() {
 ShowlbDevTem("123"); //textBox1.Text = "123";
 }

 private void button1_Click(object sender, EventArgs e) {
 // ShowlbDevTem("112");
 }
 public void test(string str) {
 ShowlbDevTem(str); }  public delegate void SWTDelegate(string AddStr); //public delegate void ComsumerTextDelegate(int Index, string AddStr); public void ShowlbDevTem(string AddStr) { if (textBox1.InvokeRequired) { SWTDelegate pd = new SWTDelegate(ShowlbDevTem); textBox1.Invoke(pd, new object[] { AddStr }); } else { textBox1.Text = AddStr; //richTextBox1.AppendText(AddStr); } }
 /* public void dataShow(int row, int column, string str) { row = row % 30; ShowMessage(dataGridViewX1, str, row, column);
 }

 delegate void ShowMessageDelegate(DataGridView dg, string message, int row, int column); private void ShowMessage(DataGridView dg, string message, int row, int column) { if (dg.InvokeRequired) { ShowMessageDelegate showMessageDelegate = ShowMessage; dg.Invoke(showMessageDelegate, new object[] { dg, message, row, column }); } else {
 dg.Rows[row].Cells[column].Value = message; } } */

 }}

类中：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;
using System.Threading;using System.Windows.Forms;
namespace WindowsFormsApp12{ class Class1 { public Action<string> ShowEvent; public void test() {
 ShowEvent("123456789");
 // Form1 f1 = new Form1(); //f1.ShowlbDevTem("112");

 } 
  }}

总算可以了 

但是我有两个类，线程在class1，委托在class2回调呢？

主窗体代码不变

class1代码：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;
using System.Threading;using System.Windows.Forms;
namespace WindowsFormsApp12{ class Class1 { public Action<string> ShowEvent; public void test() {

 // Class2 cs2 = new Class2(); // cs2.test(ShowEvent); Class2 cs2 = new Class2(); cs2.test(ShowEvent);
 }



 }}

class2代码

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;
using System.Threading;
namespace WindowsFormsApp12{ class Class2 { // public Action<string> ShowEvent1; public void test(Action<string> ShowEvent) {

 ShowEvent("123456789");
 }  }}

完！！！