将 Null 值分配给 DataTable 中的整数列

Assign Null value to the Integer Column in the DataTable(将 Null 值分配给 DataTable 中的整数列)

问题描述

我有一个数据表，其中一个 ColumnName "CustomerID" 和 Integer DataType.我想动态地将行添加到 DataTable.为此，我创建了一个 DataRow 对象，例如:

I have a datatable with One ColumnName "CustomerID" with Integer DataType. Dynamically I want to add rows to the DataTable. For that, I had created one DataRow object like:

  DataTable dt = new DataTable();
  DataRow DR = dt.NewRow();
  DR["CustomerID"] = Convert.ToInt32(TextBox1.Text);

但如果 TextBox 包含空字符串，则会引发错误.在这种情况下，我想将 Null 值分配给 CustomerID.如何做到这一点?

But if the TextBox contains empty string, it throws the error. In that case, I want to assign Null value to the CustomerID. How to do this?

推荐答案

空字符串格式错误；您需要检测这种情况并进行补偿:

A null/empty string is in the wrong format; you would need to detect that scenario and compensate:

    DR["CustomerID"] = string.IsNullOrWhiteSpace(text)
        ? DBNull.Value : (object)Convert.ToInt32(text);

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