c# - "The subprocess making the call can not access this object because the owner is another thread"异常异步/等待 WPF C#

Question

我有这个代码:

SecondLog.Opacity = 1;
List<Reporte> Reportes =await Task.Run(() => db_data.TraerReportes(Environment.MachineName, PickFecha.SelectedDate.Value.Date.ToShortDateString()));
    if (Reportes.Count  != 0)
    {
        DataTable dt = new DataTable();
        dt.Columns.Add("Nombre del Proceso");
        dt.Columns.Add("Tiempo Activo");
        dt.Columns.Add("Hora del Ultimo Reporte");
        foreach (Reporte R in Reportes)
        {
            TimeSpan a = TimeSpan.FromSeconds(R.TiempoActivo);
            var Columna = dt.NewRow();
            Columna["t1"] = R.NombreProceso;
            Columna["t2"] = a.ToString(@"hh\:mm\:ss");
            Columna["t3"] = R.Fecha;

            dt.Rows.Add(Columna);
            }
            GridReportes.DataContext = dt.DefaultView;
        }

这将返回:

The subprocess making the call can not access this object because the owner is another thread" exception at line 2 ( List Reportes =await Task.Run(() => db_SpixService.TraerReportes(Environment.MachineName, PickFecha.SelectedDate.Value.Date.ToShortDateString()));)

这是为什么？

Answer 1

// this is the part that cannot run on another thread, so prepare it
string param = PickFecha.SelectedDate.Value.Date.ToShortDateString();

List<Reporte> Reportes = await Task.Run(() => 
    db_data.TraerReportes(Environment.MachineName, param));

您不需要任何其他更改，您不应该需要 Control.Invoke()。
假设 TraerReportes 不执行 UI 工作。