问题: 检查两个 BackgroundWorkers 是否返回 true 的最佳方法是什么 或者如果两者都没有返回 true,或者只有一个返回 true。
其他信息:
我当前有两个BackgroundWorker 检查是否有两个SQL 连接 有效并根据连接是否成功返回一个值。
代码如下:
private void btnTestSConnection_Click(object sender, EventArgs e)
{
BackgroundWorker work1 = new BackgroundWorker { WorkerSupportsCancellation = true };
BackgroundWorker work2 = new BackgroundWorker { WorkerSupportsCancellation = true };
work1.RunWorkerCompleted += (item, a) =>
{
//need to figure out this portion
};
work2.RunWorkerCompleted += (item, a) =>
{
//need to figure out this portion
};
work1.DoWork += doWork;
work2.DoWork += doWork;
SourceString.InitialCatalog = txtSSourceDatabase.Text;
work1.RunWorkerAsync(SourceString.ConnectionString);
SourceString.InitialCatalog = txtSSystemDatabase.Text;
work2.RunWorkerAsync(SourceString.ConnectionString);
}
DoWorkEventHandler doWork = (sender, e) =>
{
SqlConnection Connection;
BackgroundWorker worker = sender as BackgroundWorker;
for (int i = 1; (i <= 10); i++)
{
try
{
using (Connection = new SqlConnection((string)e.Argument))
{
Connection.Open();
}
e.Result = true;
}
catch (SqlException c)
{
e.Result = false;
}
}
};
最佳答案
您可以返回一个 KeyValuePair,其中第一个 bool 表示使用了哪个工作线程(work1 为 true,work2 为 false),第二个 bool 是 DoWork 方法的返回值,如下所示:
work1.DoWork += doWork;
work2.DoWork += doWork;
work1.RunWorkerAsync(true);
work2.RunWorkerAsync(false);
private void doWork(s, e)
{
var kvp = new KeyValuePair<bool, bool>;
kvp.Key = e.Argument as bool; // this indicate which of the worker returned a value
...
using (Connection = new SqlConnection((string)e.Argument))
{
Connection.Open();
}
kvp.Value = true; // this is the result of your connection test
...
e.Result = kvp
};
现在,在 RunWorkerCompleted 上,您可以将 Result 转换为 KeyValuePair 并获取 work1 或 work2 是否返回哪个值。
b.RunWorkerCompleted += (item, a) =>
{
var kvp = a.Result as KeyValuePair<bool, bool>;
//kvp.Key == true mean this is the work1
//kvp.Value is the SQL connection test
};
关于c# - 确定两个 BackGroundWorker 字符串是否返回 true,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12624046/