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7.0

DataTable "Row belongs to another table" Error in certain scenarios

Asked by djcheeky in Microsoft Visual C#.Net, C# Programming Language

Hi

I have a function that gets called recursivly which is used to populate a DataTable with values representing parent to child relationships.

When I run this process via our website, this function always works without error.
However, when we call this function via an application, that batch processes a whole lot of transations at once, the system throws an error: "Row belongs to another table".

The application doesn't usually throw this error immediately though - it runs for a while successfully and then only after processing a certain amount of transations does it start throwing errors for each transation thereafter.

I can not track the exact line number of the code where it is failing as this was not supplied in the caught strack trace. I did however isolate it down to the function listed below.

Can anyone see anything wrong with the function? I know why this error typically gets called - but I can't see a scenario there that would cause this.

(PLEASE NOTE): dtChild and dtParentsAndChildren are DataTables defined on the class level, which is why you don't see a definition for them.

Thanks

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             public void ProcessChild(Guid messageTypeId, Guid parentDataChunkId, int childNodeLevel)
		{
			Boolean bHasChild;
			
			//Get children linked to parent
			dtChild = GetChild(messageTypeId, parentDataChunkId);
			
			//Loop through each child
			foreach (DataRow drChild in dtChild.Rows)
			{
				//Set current child Id
				tChildId = drChild["dataChunkId"].ToString();
 
				bHasChild = HasChild(messageTypeId,new Guid(tChildId));
				
				//Add child to datatable 
				DataRow childRow = dtParentsAndChildren.NewRow();
				childRow["nodeType"] = "child";
				childRow["nodeLevel"] = childNodeLevel;
				childRow["dataChunkId"] = drChild["dataChunkId"].ToString();
				childRow["dataChunkName"] = drChild["dataChunkName"].ToString();
				if (bHasChild)
				{
					childRow["nodeHasChild"] = true;
				}
				else
				{
					childRow["nodeHasChild"] = false;
				}
				//Add child to DataTable
				dtParentsAndChildren.Rows.Add(childRow);
 
				if (bHasChild)
				{
					//Update ParentId for Child
					parentDataChunkId = new Guid(tChildId);
					
					//Call itself recursively if this child has children
					ProcessChild(messageTypeId, new Guid(tChildId), childNodeLevel+1);
				}
			}
			return;
		}

           
         

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DataTable "Row belongs to another table" Error in certain scenarios

Asked by djcheeky in Microsoft Visual C#.Net, C# Programming Language

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