在表单加载时加载datagridview的线程（显示错误） [英] Thread to load datagridview on form load(showing error)

问题描述

嗨朋友们......



我需要将一些数据加载到datagridview.Its很少耗时。所以我决定开始一个主题。所以我在表单加载事件和调用耗时函数上创建了一个线程实例。但它抛出一个错误

跨线程操作无效：从线程以外的线程访问控件它创建于。



我的代码如下。

在表单加载事件中

线程primarythrd =  new 线程（primaryload）; 
 primarythrd.IsBackground =  true ; 
 primarythrd.SetApartmentState（System.Threading.ApartmentState.STA）; 
 primarythrd.Start（）; 

primaryload function

  public   void  primaryload（）
 {
  //  这行代码会出错。 
 dataGridView1.Rows.Add（item，malecount，femalecount，malecount + femalecount， Math.Round（calc， 0 ））; 
} 

如何解决此错误。什么是将大量数据加载到UI而不会篡改性能的最佳方法。

解决方案

我建​​议创建一个委托来仅调用数据网格视图上的方法。



一个注意事项：列至少需要存在（或者在行之前的调用中首先创建）。

  private   void 加载（）{
线程primarythrd =  new 线程（primaryload）; 
 primarythrd.IsBackground =  true ; 
 primarythrd.SetApartmentState（System.Threading.ApartmentState.STA）; 
 primarythrd.Start（）; 
} 
 
 委托  void  AddRows（DataGridView view）; 
  public   void  primaryload（）
 {
  //  这行代码会出错。 
  //   dataGridView1.Rows.Add（item，malecount，femalecount，malecount + femalecount，//Math.Round（calc，0））;  
 AddRows addRows =  new  AddRows（DoRowAdd）; 
  this  .Invoke（addRows，dataGridView1）; 
} 
 
  private   void  DoRowAdd（DataGridView view）{
  if （view.InvokeRequired）{
 AddRows rows =  new  AddRows（DoRowAdd） ; 
  this  .Invoke（rows， new   object  [] {view}）; 
} 
 其他 {
  for （ int  i =  0 ; i <   100 ; i ++）{
 view.Rows.Add（item，malecount，femalecount，malecount + femalecount， //   Math.Round（calc，0））;  
} 
} 
} 

此代码块帮助我解决问题

 此 .Invoke（ （MethodInvoker） delegate  
 {
  this  .dataGridView1.Rows.Add（item ，malecount，femalecount，malecount + femalecount，Math.Round（calc， 0 ））; 
}）; 

Hi Friends...

I need to load some datas to datagridview.Its little time consuming. so i decide to start a thread. so i created a thread instance on form load event and call time consuming function.But its throwing an error
Cross-thread operation not valid: Control '' accessed from a thread other than the thread it was created on.

My code is as follows.
In the form load event

Thread primarythrd = new Thread(primaryload);
                primarythrd.IsBackground = true;
                primarythrd.SetApartmentState(System.Threading.ApartmentState.STA);
                primarythrd.Start();

primaryload function

public void primaryload()
        {
//this line of code gives error.
dataGridView1.Rows.Add(item, malecount, femalecount, malecount + femalecount, Math.Round(calc, 0));
}

How can i solve this error. whats the best method to load huge data to UI without tampering the performance.

解决方案

I would suggest creating a delegate to invoke a method on just the data grid view.

One note: The columns at least need to be present (or created first in that invoke before the rows).

private void Load() {
Thread primarythrd = new Thread(primaryload);
    primarythrd.IsBackground = true;
    primarythrd.SetApartmentState(System.Threading.ApartmentState.STA);
    primarythrd.Start();
}

delegate void AddRows(DataGridView view);
public void primaryload()
        {
//this line of code gives error.
//dataGridView1.Rows.Add(item, malecount, femalecount, malecount + femalecount, //Math.Round(calc, 0));
AddRows addRows = new AddRows(DoRowAdd);
this.Invoke(addRows, dataGridView1);
}

private void DoRowAdd(DataGridView view) {
    if (view.InvokeRequired) {
        AddRows rows = new AddRows(DoRowAdd);
        this.Invoke(rows, new object[] { view });
    }
    else {
        for (int i = 0; i < 100; i++) {
            view.Rows.Add(item, malecount, femalecount, malecount + femalecount, //Math.Round(calc, 0));
        }
    }
}

This Code block help me to solve the issue

this.Invoke((MethodInvoker)delegate
            {
                this.dataGridView1.Rows.Add(item, malecount, femalecount, malecount + femalecount, Math.Round(calc, 0));
            });

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