How to Change a DataTable Column's Data Type from Double to Int32?

Modify the DataColumn data type in DataTable

During data processing, it is often necessary to modify the data type of specific columns in DataTable. This article describes how to convert a column in a DataTable that was originally of type "Double" to type "Int32".

It should be noted that it is not possible to directly modify the data type of the columns in the populated DataTable. However, we can effectively solve this problem by cloning the DataTable.

Solution using DataTable clone: ​​

1. Create a copy of the original DataTable using the Clone() method:

   <code class="language-csharp"> DataTable dtCloned = dt.Clone();</code>

2. Modify the data type of the target column in the cloned DataTable:

   <code class="language-csharp"> dtCloned.Columns[0].DataType = typeof(Int32);</code>

3. Import the data in the original DataTable row by row into the cloned DataTable:

   <code class="language-csharp"> foreach (DataRow row in dt.Rows)
    {
        dtCloned.ImportRow(row);
    }</code>

With the above steps, you can successfully change the data type of the specified column while maintaining data integrity. dtCloned Columns with changed data types are now included. You can replace the original dtCloned with dt.

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