由于 Windows 窗体控件本质上不是线程安全的。因此如果有两个或多个线程适度操作某一控件的状态(set value),则可能会迫使该控件进入一种不一致的状态。还可能出现其他与线程相关的 bug,包括争用和死锁的情况。于是在调试器中运行应用程序时,如果创建某控件的线程之外的其他线程试图调用该控件,则调试器会引发一个 InvalidOperationException
本文用一个很简单的示例来讲解这个问题(在窗体上放一个TextBox和一个Button,点击Button后,在新建的线程中设置TextBox的值)
解决办法一: 关闭该异常检测的方式来避免异常的出现
经过测试发现此种方法虽然避免了异常的抛出,但是并不能保证程序运行结果的正确性 (比如多个线程同时设置TextBox1的Text时,很难预计最终TextBox1的Text是什么)
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Data;
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using System.Drawing;
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using System.Text;
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using System.Windows.Forms;
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using System.Threading;
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namespace winformTest
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{
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public partial class Form1 : Form
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{
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public Form1()
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{
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InitializeComponent();
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Control.CheckForIllegalCrossThreadCalls = false;//这一行是关键
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}
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private void button1_Click(object sender, EventArgs e)
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{
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SetTextBoxValue();
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}
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void SetTextBoxValue()
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{
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TextBoxSetValue tbsv = new TextBoxSetValue(this.textBox1, "Method1");
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ThreadStart TS = new ThreadStart(tbsv.SetText);
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Thread T = new Thread(TS);
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T.Start();
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}
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class TextBoxSetValue
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{
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private TextBox _TextBox ;
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private string _Value;
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public TextBoxSetValue(TextBox TxtBox, String Value)
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{
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_TextBox = TxtBox;
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_Value = Value;
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}
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public void SetText()
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{
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_TextBox.Text = _Value;
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}
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}
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}
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}
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解决办法二:通过委托安全调用
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Data;
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using System.Drawing;
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using System.Text;
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using System.Windows.Forms;
8![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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namespace winformTest
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{
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public partial class Form2 : Form
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{
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public Form2()
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{
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InitializeComponent();
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}
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private void button1_Click(object sender, EventArgs e)
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{
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SetTextBoxValue();
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}
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private delegate void CallSetTextValue();
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//通过委托调用
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void SetTextBoxValue()
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{
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TextBoxSetValue tbsv = new TextBoxSetValue(this.textBox1, "Method2");
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if (tbsv.TextBox.InvokeRequired)
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{
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CallSetTextValue call = new CallSetTextValue(tbsv.SetText);
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tbsv.TextBox.Invoke(call);
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}
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else
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{
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tbsv.SetText();
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}
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}
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class TextBoxSetValue
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{
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private TextBox _TextBox;
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private string _Value;
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public TextBoxSetValue(TextBox TxtBox, String Value)
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{
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_TextBox = TxtBox;
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_Value = Value;
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}
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public void SetText()
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{
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_TextBox.Text = _Value;
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}
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public TextBox TextBox {
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set { _TextBox = value; }
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get { return _TextBox; }
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}
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}
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}
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}
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