问题描述

我正在尝试使用 C# 在现有数据集中插入一列.

I'm trying to insert a column into an existing DataSet using C#.

作为一个例子，我有一个如下定义的数据集:

As an example I have a DataSet defined as follows:

DataSet ds = new DataSet();
ds.Tables.Add(new DataTable());
ds.Tables[0].Columns.Add("column_1", typeof(string));
ds.Tables[0].Columns.Add("column_2", typeof(int));
ds.Tables[0].Columns.Add("column_4", typeof(string));

稍后在我的代码中，我想在第 2 列和第 4 列之间插入一列.

later on in my code I am wanting to insert a column between column 2 and column 4.

DataSet 有添加列的方法，但我似乎找不到插入列的最佳方法.

DataSets have methods for adding a column but I can't seem to find the best way in insert one.

我想写一些类似下面的东西......

I'd like to write something like the following...

...Columns.InsertAfter("column_2", "column_3", typeof(string))

最终结果应该是一个包含以下列的表的数据集:column_1 column_2 column_3 column_4

The end result should be a data set that has a table with the following columns: column_1 column_2 column_3 column_4

而不是:column_1 column_2 column_4 column_3 这是 add 方法给我的

rather than: column_1 column_2 column_4 column_3 which is what the add method gives me

肯定有办法做这样的事情.

surely there must be a way of doing something like this.

编辑...只是想根据下面的一些评论澄清我对 DataSet 所做的事情:

Edit...Just wanting to clarify what I'm doing with the DataSet based on some of the comments below:

我正在从存储的程序.然后我必须添加数据集的附加列然后将其转换为 Excel文档.我无法控制存储过程返回的数据所以我必须在之后添加列事实.

I am getting a data set from a stored procedure. I am then having to add additional columns to the data set which is then converted into an Excel document. I do not have control over the data returned by the stored proc so I have to add columns after the fact.

推荐答案

您可以使用 DataColumn.SetOrdinal() 用于此目的的方法.

You can use the DataColumn.SetOrdinal() method for this purpose.

DataSet ds = new DataSet();
ds.Tables.Add(new DataTable());
ds.Tables[0].Columns.Add("column_1", typeof(string));
ds.Tables[0].Columns.Add("column_2", typeof(int));
ds.Tables[0].Columns.Add("column_4", typeof(string));
ds.Tables[0].Columns.Add("column_3", typeof(string));
//set column 3 to be before column 4
ds.Tables[0].Columns[3].SetOrdinal(2);

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