[英]TargetInvocationException Being Thrown c#
我有一个例程,需要后台工作人员完成。 如下;
private void BatteryListFetchBackgroundWorkerRunWorkerCompleter(object sender, RunWorkerCompletedEventArgs e)
{
this.Cursor = Cursors.Default;
var sortedList = this.currentBatteries.Values.OrderBy(g => g, new BatteryNameComparer()); //breaks here
this.BatteryBindingSource.DataSource = sortedList;
if (this.batteryListBox.Items.Count > 0)
{
this.batteryListBox.SetSelected(0, true);
}
this.viewScheduleButton.Enabled = true;
this.viewDefaultScheduleButton.Enabled = true;
this.viewEditScheduleLimits.Enabled = true;
}
它所处的界限是;
this.BatteryBindingSource.DataSource = sortedList;
该异常为空引用异常,它在设置数据源时发生
BatteryNameComparer
的代码
public class BatteryNameComparer : IComparer<Battery>
{
/// <summary>
/// Compares DDSMGroup
/// </summary>
/// <param name="a">first value for comparison</param>
/// <param name="b">second value for comparison</param>
/// <returns>An integer indicating the compare result</returns>
public int Compare(Battery a, Battery b)
{
int aId = int.Parse(a.DeviceName.Substring(BatteryOverviewControl.BatteryPrefixSubstring.Length));
int bId = int.Parse(b.DeviceName.Substring(BatteryOverviewControl.BatteryPrefixSubstring.Length));
return aId.CompareTo(bId);
}
}
每当看到TargetInvocationException
,都应立即检查其InnerException
属性以查找实际引发的异常。
http://msdn.microsoft.com/zh-CN/library/system.exception.innerexception(v=vs.110).aspx
简而言之, TargetInvocationException
仅告诉您在某种调用上下文中引发了另一个异常-这几乎总是跨线程操作或通过反射进行的调用。
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