DataGridView 在多线程中使用可能出现大红叉，解决方法如下

最新推荐文章于 2025-05-04 14:10:54 发布

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最新推荐文章于 2025-05-04 14:10:54 发布

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分类专栏： C# 总结及相关问题探讨文章标签：多线程 datagridview

本文链接：https://blog.youkuaiyun.com/yeyoushengyilang/article/details/22979665

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本文详细介绍了在使用DataGridView控件进行多线程数据更新时遇到的大红叉问题，并提供了通过重新封装控件和OnPaint方法来确保控件线程安全性的解决方案。经过测试，此方法有效防止了异常显示情况的发生。

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今天做了一个多线程实现 DataGridView 动态更新数据，但是在动态实现更新数据达到20次左右时，DataGridView 突然变成一个大红叉，通过查询，解决如下：

老外的解释：
The DataGridView is a common .Net control used to display and permit editing of tabular data. It can be filled in via code or by attaching a data source to it.
DataGridViews, like most controls, are not thread-safe. That is, you need to perform operations on them using the same thread as they were created on. However, sometimes OpenSpan developers will accidently modify the DataGridView from another thread because the operation is coming from an event in another application.
A safe way to correct this problem and to ensure it doesn't accidently happen is to postpone updating the control during a OnPaint() event if it happens from another thread. This is done by handling an exception and then flagging the control to be redrawn when the MessagePump is run. You can do this by creating a .Net class that inherits from DataGridView and overrides the OnPaint() event. You will need access to a C# compiler to build this. Once built, you add it to the OpenSpan Studio Toolbox and replace your DataGridView controls with it.
（引用地址： http://wenku.baidu.com/link?url=uLLKAHMKVzub20zu--98KrBOsUnMB5qIa10CXaBjhq-AKHDLifA3V8j5gpM996vglpIq1-4aq26X7-rNJ-t_EbIEqtNtet0TT6rnVRYJh7G）

处理的方法，重新封装DataGridView 控件，重新OnPaint 方法，代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Windows.Forms;

namespace wstest
{
    class DataGridViewForWs : DataGridView
    {
        protected override void OnPaint(PaintEventArgs e)
        {
            try
            {
                base.OnPaint(e);
            }
            catch
            {

                Invalidate();
            }
        }

    }
}

使用封装的控件以后，经过多次测试，没有再出现大红叉！