Not able to dispose DataTable in foreach loop [closed]

问题

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Closed 3 years ago.

In my Dispose method I am disposing everything a Dataset has as below:

foreach (DataTable myTable in this.Tables)
{
    myTable.Dispose();
}

Here this.Tables is public DataTableCollection Tables { get; }

I am having around 56 tables in this.Tables when it comes near to this call.

It works fine for few tables but suddenly it throws:

System.InvalidOperationException: Collection modified error

I am not sure why is this happening.

I tried to search for this exception a lot but i could not fine why it is breaking in my application.

May be because of threading? or I need to convert it to a list?

回答1:

The exception is because the collection is modified when it's being enumerated. This answer explains well.

The difference is you are enumerating a DataTableCollection, which is not a generic collection so the solution in the linked answer is not suitable in this case. You can cast the collection to a generic one and then enumerate it.

foreach (DataTable thisTable in this.Tables.Cast<DataTable>().ToArray())

来源：https://stackoverflow.com/questions/36215695/not-able-to-dispose-datatable-in-foreach-loop