C# winform 多线程异步操作线程启动暂停与恢复

/// <summary>
/// 线程控制模块
/// </summary>
private ManualResetEvent manualResetEvent = new ManualResetEvent(false);
/// <summary>
/// 配合使用
/// </summary>
private AutoResetEvent autoResetEvent = new AutoResetEvent(true);
private AsyncOperation asyncOperation = AsyncOperationManager.CreateOperation(null);

/// <summary>
/// 存储状态
/// </summary>
private bool suspend;

/// <summary>
/// 委托操作模块
/// </summary>
/// <param name="str"></param>
private delegate void InvokeDelegate(string str);
private delegate void InvokeMessage(int result);
private delegate string[] InvokeMessageResult(int result);
private delegate void InvokeListView(string oneValue, string twoValue, string threeValue, string four,string five);
private delegate void InvokeMessageUI(string msg, string value);
private delegate void InvokeMessageViewUI(string[] value);
private delegate void InvokeExecute();

/// <summary>
///
/// </summary>
private bool formClosed = false;

private void btnDowload_Click(object sender, EventArgs e)
{
//启动下载任务
if (this.btnDowload.Tag == null)
{
ThreadPool.QueueUserWorkItem(delegate
{
ExecuteDownload(this.txtPath.Text);
});
}
else if (this.btnDowload.Tag.ToString() == "Run")
{
this.suspend = true;
manualResetEvent.Reset();
//autoResetEvent.Reset();//另一种方式

//更改执行按钮状态
EvenInvokeButtionProcess("继续下载", "Reset");
}
else if (this.btnDowload.Tag.ToString() == "Reset")
{
//
this.suspend = false;
manualResetEvent.Set();
//autoResetEvent.Set();//另一种方式

//更改执行按钮状态
EvenInvokeButtionProcess("暂停下载", "Run");
}
/** ----------------------------------------
* ThreadPool.QueueUserWorkItem(delegate
*   {
*       ExecuteDownload(this.txtPath.Text);
*   });
* -----------------挂起下载任务------------
*  this.suspend = true;
*  manualResetEvent.Reset();
*  //autoResetEvent.Reset();//另一种方式
*  -----------------唤醒下载任务-------------
*  this.suspend = false;
*  manualResetEvent.Set();
*  //autoResetEvent.Set();//另一种方式
***/
}

/// <summary>
/// 下载档案文件
/// </summary>
public void ExecuteDownload(string savePath)
{
//EvenInvokeButtionState("btnDowload", "false");
//更改执行按钮状态
EvenInvokeButtionProcess("暂停下载", "Run");
//更改控件展示状态
EvenInvokeButtionState("btnGet", "false");
//初始化进度条
EventInvokeProgresBarInit(0);
//初始化进度条最大值
int count = this.listView1.Items.Count;
EventProgresMaximum(count);
//this.listView1.Items 的下标从0开始，所以取值时，下标为 Count - 1
for (int i = this.listView1.Items.Count; i > 0; i--)
{
int rowIndex = 0;
//1.取得一条数据，
if (i == 0)
{
rowIndex = i;
}
else
{
rowIndex = i - 1;
}
/**
* this.listView1.Items 的下标从0开始，所以取值时，下标为 Count - 1,因为 Count 计数器，是从 1开始记录，所以相差1
* */
EventListViewSelected(rowIndex);
//获取列表
string[] ls = EventListViewGet(rowIndex);
//更新操作状态
EventInvokeListBoxText("---------------------------------------------------------", "");
EventInvokeListBoxText("开始下载:", ls[1].ToString() + "档案文件");
//更新比例
EventProgresTipText(count.ToString(), "/" + (rowIndex));
//执行下载操作
ExecuteDownload(ls[0].ToString(), ls[1].ToString(), savePath);
//将比对完成之后的数据移除
EventListViewRemoveAt(rowIndex);
//更新进度条状态
EventInvokeProgresBar(1);
//---------------------------------------------------------------------------
if (formClosed)
{
return;
}
//监听任务状态
if (suspend)
{
//更改执行按钮状态
EvenInvokeButtionProcess("继续下载", "Reset");
//挂起任务
this.manualResetEvent.WaitOne();
}
/** -------------------------另一种方式-------------------------------------
*  if (suspend)
*   {
*       this.autoResetEvent.WaitOne();
*   }
*   asyncOperation.Post(delegate { EventMessageBox(str); }, str);
**/
}
//更新进度条状态
EventInvokeProgresBar(-100); //-100 为状态位
//设置按钮状态
EvenInvokeButtionState("btnGet", "true");
//EvenInvokeButtionState("btnDowload", "true");
//更改执行按钮状态
EvenInvokeButtionProcess("文件下载", null);
//数据加载完毕,设置提示信息
EventInvokeListBoxText("---------------------------------------------------------","");
EventInvokeListBoxText("执行状态:", "档案文件已经下载完毕,等待相关任务执行中.........");
}

/// <summary>
/// 进度提示委托
/// </summary>
/// <param name="mes"></param>
/// <param name="value"></param>
public void EventInvokeListBoxText(string msg, string value)
{
this.Invoke(new InvokeMessageUI(InvokeListBoxText), new object[] { msg, value });
}

/// <summary>
/// 进度提示条改变
/// </summary>
/// <param name="mes"></param>
/// <param name="value"></param>
public void InvokeListBoxText(string msg, string value)
{
if (this.listBox1.Items.Count == 0)
{
this.listBox1.Items.Insert(0, msg + value);
}
else
{
this.listBox1.Items.Insert(this.listBox1.Items.Count -1, msg + value);
}
//this.listBox1.SelectedIndex = this.listBox1.Items.Count - 1;
this.listBox1.TopIndex = this.listBox1.Items.Count - (int)(this.listBox1.Height / this.listBox1.ItemHeight);
}

/// <summary>
///
/// </summary>
/// <param name="msg"></param>
/// <param name="value"></param>
private void EvenInvokeButtionProcess(string msg, string value)
{
this.Invoke(new InvokeMessageUI(InvokeButtionProcessUI), new object[] { msg, value });
}

private void InvokeButtionProcessUI(string msg, string value)
{
this.btnDowload.Tag = value;
this.btnDowload.Text = msg;
}