C# 使用BackgroundWorker时发生异常

我正在尝试将一些数据填充到BackgroundWorker中的自定义网格中。如果数据很小，那么它可以正常工作，但是如果数据很大，我会随机得到异常。有时我得到“NullReferenceException未经用户代码处理”，有时我得到“ArgumentOutOfRangeException未经用户代码处理”。下面我提到了我面临的一些例外情况

基本上，我在Populate（）方法中所做的是，通过使用foreach循环，我分配自定义网格中每个单元格的值。当我不使用BackgroundWorker时，这可以正常工作。但是在使用BackgroundWorker时，我在将其分配给单元格时会得到空值。因此出现了许多例外情况。我不知道为什么会这样。有什么建议可以克服这个问题吗

下面是我正在使用的代码

代码：

BackgroundWorker worker = new BackgroundWorker();

worker.DoWork += (sender, args) =>
{
if (this.PivotEngine.DataSource != null && this.PivotCalculations.Count > 0)
{

    // Populates the data for the grid. 
    // Without using the BackgroundWorker, the values are been populated properly.
    this.PivotEngine.Populate();        

}

};

worker.RunWorkerCompleted += (s, e) =>
{
MessageBox.Show("Process is complete");
};

if (!worker.IsBusy)
{
  worker.RunWorkerAsync();
}

Exception:
System.NullReferenceException was unhandled by user code
HResult=-2147467261
Message=Object reference not set to an instance of an object.
Source=Syncfusion.PivotAnalysis.Base
StackTrace:
   at Syncfusion.PivotAnalysis.Base.PivotEngine.PopulatePivotTable() in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 5882
   at Syncfusion.PivotAnalysis.Base.PivotEngine.ResumeComputations(Boolean resetPivotCollections, Boolean shouldRefresh) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 2735
   at Syncfusion.PivotAnalysis.Base.PivotEngine.ResumeComputations(Boolean resetPivotCollections) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 2718
   at Syncfusion.PivotAnalysis.Base.PivotEngine.Populate() in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 2829
   at Syncfusion.Windows.Forms.PivotAnalysis.PivotGridControlBase.Populate(PivotEngine pe, Boolean checkLazyLoading) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Windows\Src\PivotGridControl\Core\PivotGridControlBase.cs:line 2990
   at Syncfusion.Windows.Forms.PivotAnalysis.PivotGridControlBase.<>c__DisplayClass1d.<ApplyRowCols>b__1a(Object sender, DoWorkEventArgs args) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Windows\Src\PivotGridControl\Core\PivotGridControlBase.cs:line 3016
   at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)
   at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)
 InnerException: 

System.ArgumentOutOfRangeException was unhandled by user code
HResult=-2146233086
Message=Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
Source=mscorlib
ParamName=index
 StackTrace:
   at System.ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument argument, ExceptionResource resource)
   at System.Collections.Generic.List`1.get_Item(Int32 index)
   at Syncfusion.PivotAnalysis.Base.PivotEngine.PopulatePivotTable() in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 5932
   at Syncfusion.PivotAnalysis.Base.PivotEngine.ResumeComputations(Boolean resetPivotCollections, Boolean shouldRefresh) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 2735
   at Syncfusion.PivotAnalysis.Base.PivotEngine.ResumeComputations(Boolean resetPivotCollections) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 2718
   at Syncfusion.PivotAnalysis.Base.PivotEngine.Populate() in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 2829
   at Syncfusion.Windows.Forms.PivotAnalysis.PivotGridControlBase.Populate(PivotEngine pe, Boolean checkLazyLoading) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Windows\Src\PivotGridControl\Core\PivotGridControlBase.cs:line 2990
   at Syncfusion.Windows.Forms.PivotAnalysis.PivotGridControlBase.<>c__DisplayClass1d.<ApplyRowCols>b__1a(Object sender, DoWorkEventArgs args) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Windows\Src\PivotGridControl\Core\PivotGridControlBase.cs:line 3016
   at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)
   at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)
 InnerException:

例外情况1:

BackgroundWorker worker = new BackgroundWorker();

worker.DoWork += (sender, args) =>
{
if (this.PivotEngine.DataSource != null && this.PivotCalculations.Count > 0)
{

    // Populates the data for the grid. 
    // Without using the BackgroundWorker, the values are been populated properly.
    this.PivotEngine.Populate();        

}

};

worker.RunWorkerCompleted += (s, e) =>
{
MessageBox.Show("Process is complete");
};

if (!worker.IsBusy)
{
  worker.RunWorkerAsync();
}

Exception:
System.NullReferenceException was unhandled by user code
HResult=-2147467261
Message=Object reference not set to an instance of an object.
Source=Syncfusion.PivotAnalysis.Base
StackTrace:
   at Syncfusion.PivotAnalysis.Base.PivotEngine.PopulatePivotTable() in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 5882
   at Syncfusion.PivotAnalysis.Base.PivotEngine.ResumeComputations(Boolean resetPivotCollections, Boolean shouldRefresh) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 2735
   at Syncfusion.PivotAnalysis.Base.PivotEngine.ResumeComputations(Boolean resetPivotCollections) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 2718
   at Syncfusion.PivotAnalysis.Base.PivotEngine.Populate() in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 2829
   at Syncfusion.Windows.Forms.PivotAnalysis.PivotGridControlBase.Populate(PivotEngine pe, Boolean checkLazyLoading) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Windows\Src\PivotGridControl\Core\PivotGridControlBase.cs:line 2990
   at Syncfusion.Windows.Forms.PivotAnalysis.PivotGridControlBase.<>c__DisplayClass1d.<ApplyRowCols>b__1a(Object sender, DoWorkEventArgs args) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Windows\Src\PivotGridControl\Core\PivotGridControlBase.cs:line 3016
   at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)
   at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)
 InnerException: 

System.ArgumentOutOfRangeException was unhandled by user code
HResult=-2146233086
Message=Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
Source=mscorlib
ParamName=index
 StackTrace:
   at System.ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument argument, ExceptionResource resource)
   at System.Collections.Generic.List`1.get_Item(Int32 index)
   at Syncfusion.PivotAnalysis.Base.PivotEngine.PopulatePivotTable() in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 5932
   at Syncfusion.PivotAnalysis.Base.PivotEngine.ResumeComputations(Boolean resetPivotCollections, Boolean shouldRefresh) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 2735
   at Syncfusion.PivotAnalysis.Base.PivotEngine.ResumeComputations(Boolean resetPivotCollections) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 2718
   at Syncfusion.PivotAnalysis.Base.PivotEngine.Populate() in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 2829
   at Syncfusion.Windows.Forms.PivotAnalysis.PivotGridControlBase.Populate(PivotEngine pe, Boolean checkLazyLoading) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Windows\Src\PivotGridControl\Core\PivotGridControlBase.cs:line 2990
   at Syncfusion.Windows.Forms.PivotAnalysis.PivotGridControlBase.<>c__DisplayClass1d.<ApplyRowCols>b__1a(Object sender, DoWorkEventArgs args) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Windows\Src\PivotGridControl\Core\PivotGridControlBase.cs:line 3016
   at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)
   at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)
 InnerException:

异常：
用户代码未处理System.NullReferenceException
HResult=-2147467261
Message=对象引用未设置为对象的实例。
Source=Syncfusion.PivotAnalysis.Base
堆栈跟踪：
在d:\Work\u Vol4\svn\studio\trunk\Work\u area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs中的Syncfusion.PivotAnalysis.Base.PivotEngine.PopulatePivotTable（）处：第5882行
在Syncfusion.PivotAnalysis.Base.PivotEngine.Resumes（布尔重置PivotCollections，Boolean shouldRefresh）中的d:\Work\u Vol4\svn\studio\trunk\Work\u area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:第2735行
在Syncfusion.PivotAnalysis.Base.PivotEngine.Resumesculations（布尔重置PivotCollections）中的d:\Work\u Vol4\svn\studio\trunk\Work\u area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:第2718行
在d:\Work\u Vol4\svn\studio\trunk\Work\u area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs中的Syncfusion.PivotAnalysis.Base.PivotEngine.Populate（）处：第2829行
在Syncfusion.Windows.Forms.PivotAnalysis.PivotGridControlBase.Populate（PivotEngine pe，Boolean checkLazyLoading）中的d:\Work\u Vol4\svn\studio\trunk\Work\u area\GridWF\Engineer\PivotAnalysis.Windows\Src\PivotGridControl\Core\PivotGridControlBase.cs:第2990行
在Syncfusion.Windows.Forms.PivotAnalysis.PivotGridControlBase.c__中，在d:\Work\U Vol4\svn\studio\trunk\Work\area\GridWF\Engineer\PivotAnalysis.Windows\Src\PivotGridControl\Core\PivotGridControlBase.cs:第3016行中显示ClassAD.b_1a（对象发送方，DoWorkEventArgs args参数）
at System.ComponentModel.BackgroundWorker.OnDoWork（DoWorkEventTargets e）
位于System.ComponentModel.BackgroundWorker.WorkerThreadStart（对象参数）
内部异常：

例外情况2:

BackgroundWorker worker = new BackgroundWorker();

worker.DoWork += (sender, args) =>
{
if (this.PivotEngine.DataSource != null && this.PivotCalculations.Count > 0)
{

    // Populates the data for the grid. 
    // Without using the BackgroundWorker, the values are been populated properly.
    this.PivotEngine.Populate();        

}

};

worker.RunWorkerCompleted += (s, e) =>
{
MessageBox.Show("Process is complete");
};

if (!worker.IsBusy)
{
  worker.RunWorkerAsync();
}

Exception:
System.NullReferenceException was unhandled by user code
HResult=-2147467261
Message=Object reference not set to an instance of an object.
Source=Syncfusion.PivotAnalysis.Base
StackTrace:
   at Syncfusion.PivotAnalysis.Base.PivotEngine.PopulatePivotTable() in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 5882
   at Syncfusion.PivotAnalysis.Base.PivotEngine.ResumeComputations(Boolean resetPivotCollections, Boolean shouldRefresh) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 2735
   at Syncfusion.PivotAnalysis.Base.PivotEngine.ResumeComputations(Boolean resetPivotCollections) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 2718
   at Syncfusion.PivotAnalysis.Base.PivotEngine.Populate() in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 2829
   at Syncfusion.Windows.Forms.PivotAnalysis.PivotGridControlBase.Populate(PivotEngine pe, Boolean checkLazyLoading) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Windows\Src\PivotGridControl\Core\PivotGridControlBase.cs:line 2990
   at Syncfusion.Windows.Forms.PivotAnalysis.PivotGridControlBase.<>c__DisplayClass1d.<ApplyRowCols>b__1a(Object sender, DoWorkEventArgs args) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Windows\Src\PivotGridControl\Core\PivotGridControlBase.cs:line 3016
   at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)
   at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)
 InnerException: 

System.ArgumentOutOfRangeException was unhandled by user code
HResult=-2146233086
Message=Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
Source=mscorlib
ParamName=index
 StackTrace:
   at System.ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument argument, ExceptionResource resource)
   at System.Collections.Generic.List`1.get_Item(Int32 index)
   at Syncfusion.PivotAnalysis.Base.PivotEngine.PopulatePivotTable() in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 5932
   at Syncfusion.PivotAnalysis.Base.PivotEngine.ResumeComputations(Boolean resetPivotCollections, Boolean shouldRefresh) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 2735
   at Syncfusion.PivotAnalysis.Base.PivotEngine.ResumeComputations(Boolean resetPivotCollections) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 2718
   at Syncfusion.PivotAnalysis.Base.PivotEngine.Populate() in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line 2829
   at Syncfusion.Windows.Forms.PivotAnalysis.PivotGridControlBase.Populate(PivotEngine pe, Boolean checkLazyLoading) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Windows\Src\PivotGridControl\Core\PivotGridControlBase.cs:line 2990
   at Syncfusion.Windows.Forms.PivotAnalysis.PivotGridControlBase.<>c__DisplayClass1d.<ApplyRowCols>b__1a(Object sender, DoWorkEventArgs args) in d:\Work_Vol4\svn\studio\trunk\work_area\GridWF\Engineer\PivotAnalysis.Windows\Src\PivotGridControl\Core\PivotGridControlBase.cs:line 3016
   at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)
   at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)
 InnerException:

System.ArgumentOutOfRangeException未由用户代码处理
HResult=-2146233086
Message=索引超出范围。必须为非负数且小于集合的大小。
参数名称：索引
Source=mscorlib
参数名=索引
堆栈跟踪：
在System.ThrowHelper.ThrowarGumentofrangeException处（ExceptionArgument参数，ExceptionResource资源）
位于System.Collections.Generic.List`1.get_项（Int32索引）
在d:\Work\u Vol4\svn\studio\trunk\Work\u area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs中的Syncfusion.PivotAnalysis.Base.PivotEngine.PopulatePivotTable（）处：第5932行
在Syncfusion.PivotAnalysis.Base.PivotEngine.Resumes（布尔重置PivotCollections，Boolean shouldRefresh）中的d:\Work\u Vol4\svn\studio\trunk\Work\u area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:第2735行
在Syncfusion.PivotAnalysis.Base.PivotEngine.Resumesculations（布尔重置PivotCollections）中的d:\Work\u Vol4\svn\studio\trunk\Work\u area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:第2718行
在d:\Work\u Vol4\svn\studio\trunk\Work\u area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs中的Syncfusion.PivotAnalysis.Base.PivotEngine.Populate（）处：第2829行
在Syncfusion.Windows.Forms.PivotAnalysis.PivotGridControlBase.Populate（PivotEngine pe，Boolean checkLazyLoading）中的d:\Work\u Vol4\svn\studio\trunk\Work\u area\GridWF\Engineer\PivotAnalysis.Windows\Src\PivotGridControl\Core\PivotGridControlBase.cs:第2990行
在Syncfusion.Windows.Forms.PivotAnalysis.PivotGridControlBase.c__中，在d:\Work\U Vol4\svn\studio\trunk\Work\area\GridWF\Engineer\PivotAnalysis.Windows\Src\PivotGridControl\Core\PivotGridControlBase.cs:第3016行中显示ClassAD.b_1a（对象发送方，DoWorkEventArgs args参数）
at System.ComponentModel.BackgroundWorker.OnDoWork（DoWorkEventTargets e）
位于System.ComponentModel.BackgroundWorker.WorkerThreadStart（对象参数）
内部异常：

我在使用BackgroundWorker时是否遗漏了什么。任何帮助都将不胜感激

问候,

---

Anish。

在检查堆栈跟踪和all时，似乎在

ResumeCompulation（）方法之后调用了两次Populate（）方法本身

在中的Syncfusion.PivotAnalysis.Base.PivotEngine.PopulatePivotTable（）处
d:\Work\u Vol4\svn\studio\trunk\Work\u area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line
5932 at
Syncfusion.PivotAnalysis.Base.PivotEngine.ResumeComputions（布尔值）
重置数据透视集合，布尔值应为（刷新）
d:\Work\u Vol4\svn\studio\trunk\Work\u area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line
2735在
Syncfusion.PivotAnalysis.Base.PivotEngine.ResumeComputions（布尔值）
在中重置数据透视（集合）
d:\Work\u Vol4\svn\studio\trunk\Work\u area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line
2718在中的Syncfusion.PivotAnalysis.Base.PivotEngine.Populate（）处
d:\Work\u Vol4\svn\studio\trunk\Work\u area\GridWF\Engineer\PivotAnalysis.Base\Src\Engine\PivotEngine.cs:line
2829在
Syncfusion.Windows.Forms.PivotAnalysis.PivotGridControlBase.Populate（数据透视引擎
体育

您必须避免此类重复的递归调用以停止此异常。
检查OnDoWor中的this.PivotEngine是否为空