将C＃DataSet导出到文本文件 [英] Export a C# DataSet to a text file

问题描述

在线上有很多关于如何从文本文件填充DataSet的示例，但是我想反过来。我唯一能找到的是这个，但似乎...不完整？

There are a lot of examples online of how to fill a DataSet from a text file but I want to do the reverse. The only thing I've been able to find is this but it seems... incomplete?

我想要以可读格式，不仅仅是逗号分隔，所以每行上的列之间的间距是不相等的。这是我的意思的一个例子：

I want it to be in a readable format, not just comma delimited, so non-equal spacing between columns on each row if that makes sense. Here is an example of what I mean:

Column1          Column2          Column3
Some info        Some more info   Even more info
Some stuff here  Some more stuff  Even more stuff
Bits             and              bobs

注意：我在DataSet中只有一个DataTable，所以没有必要担心多个DataTable。

Note: I only have one DataTable within my DataSet so no need to worry about multiple DataTables.

编辑：当我说可读我的意思是可读的。

When I said "readable" I meant human-readable.

提前感谢

推荐答案

这应该很好地排除固定长度的字体文字，但是它的确意味着它会处理完整的DataTable两次（通过1：每列查找最长文本，传递2：输出文本）：

This should space out fixed length font text nicely, but it does mean it will process the full DataTable twice (pass 1: find longest text per column, pass 2: output text):

    static void Write(DataTable dt, string outputFilePath)
    {
        int[] maxLengths = new int[dt.Columns.Count];

        for (int i = 0; i < dt.Columns.Count; i++)
        {
            maxLengths[i] = dt.Columns[i].ColumnName.Length;

            foreach (DataRow row in dt.Rows)
            {
                if (!row.IsNull(i))
                {
                    int length = row[i].ToString().Length;

                    if (length > maxLengths[i])
                    {
                        maxLengths[i] = length;
                    }
                }
            }
        }

        using (StreamWriter sw = new StreamWriter(outputFilePath, false))
        {
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                sw.Write(dt.Columns[i].ColumnName.PadRight(maxLengths[i] + 2));
            }

            sw.WriteLine();

            foreach (DataRow row in dt.Rows)
            {
                for (int i = 0; i < dt.Columns.Count; i++)
                {
                    if (!row.IsNull(i))
                    {
                        sw.Write(row[i].ToString().PadRight(maxLengths[i] + 2));
                    }
                    else
                    {
                        sw.Write(new string(' ', maxLengths[i] + 2));
                    }
                }

                sw.WriteLine();
            }

            sw.Close();
        }
    }

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