C# 如何从其他数据表创建具有列结构的新数据表？
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How to create new DataTable with column structure from other DataTable?
提问by Kamil
As in title - the question is:
正如标题 - 问题是：
How to create new DataTable with column structure from other DataTable?
如何从其他数据表创建具有列结构的新数据表？
I need empty DataTable to use .Rows.Add()method in it.
我需要空的 DataTable 才能.Rows.Add()在其中使用方法。
Code:
代码：
DataTable dtFirst = new DataTable();
dtFirst.Columns.Add("column1");
dtFirst.Columns.Add("column2");
dtFirst.Columns.Add("column3");
FillDataTableFirst(); // before I create second DataTable - dtFirst is filled
// here I need dtSecond DataTable with same column structure
// i cant just copy first data table, because it contains data
DataTable dtSecond = ???;
采纳答案by Bridge
You are looking for the DataTable.Clone()method (available since framework version 1.1).
您正在寻找该DataTable.Clone()方法（自框架版本 1.1 起可用）。
From the documentation:
从文档：
Clone creates a new DataTable with the same structure as the original DataTable, but does not copy any data (the new DataTable will not contain any DataRows). To copy both the structure and data into a new DataTable, use Copy.
Clone 创建一个与原始 DataTable 具有相同结构的新 DataTable，但不复制任何数据（新 DataTable 将不包含任何 DataRow）。要将结构和数据都复制到新的 DataTable 中，请使用 Copy。
In your example:
在你的例子中：
DataTable dtFirst = new DataTable();
dtFirst.Columns.Add("column1");
dtFirst.Columns.Add("column2");
dtFirst.Columns.Add("column3");
FillDataTableFirst(); // before I create second DataTable - dtFirst is filled
DataTable dtSecond = dtFirst.Clone();
回答by Tim Schmelter
Just use DataTable.Clonewhich clones the schema but not the data:
只需使用DataTable.Clonewhich 克隆模式而不是数据：
DataTable dtSecond = dtFirst.Clone(); // empty
Now you can start adding new rows:
现在您可以开始添加新行：
DataRow newRow = dtSecond.Rows.Add();
newRow.SetField("column1", "Value1");
newRow.SetField("column2", "Value2");
newRow.SetField("column3", "Value3");
