如何在C#中将DataTable转换为字符串？

Question

我正在使用Visual Studio 2005,并且有一个DataTable,其中包含两列和一些我要输出到控制台的行.我希望有类似的东西:

DataTable results = MyMethod.GetResults();
Console.WriteLine (results.ToString());

将简单的DataTable转换为字符串的最佳方法是什么(即我编码的最少量)？

Answer 1

string res = string.Join(Environment.NewLine, 
    results.Rows.OfType<DataRow>().Select(x => string.Join(" ; ", x.ItemArray)));

Answer 2

迟到但这是我用的

 public static string ConvertDataTableToString(DataTable dataTable)
    {
        var output = new StringBuilder();

        var columnsWidths = new int[dataTable.Columns.Count];

        // Get column widths
        foreach (DataRow row in dataTable.Rows)
        {
           for(int i = 0; i < dataTable.Columns.Count; i++)
           {
               var length = row[i].ToString().Length;
               if (columnsWidths[i] < length)
                   columnsWidths[i] = length;
           }     
        }

        // Get Column Titles
        for (int i = 0; i < dataTable.Columns.Count; i++)
        {
            var length = dataTable.Columns[i].ColumnName.Length;
               if (columnsWidths[i] < length)
                   columnsWidths[i] = length;
        }

        // Write Column titles
        for (int i = 0; i < dataTable.Columns.Count; i++)
        {
            var text = dataTable.Columns[i].ColumnName;
            output.Append("|" + PadCenter(text, columnsWidths[i] + 2));
        }
        output.Append("|\n" + new string('=', output.Length) + "\n");

        // Write Rows
        foreach (DataRow row in dataTable.Rows)
        {
            for (int i = 0; i < dataTable.Columns.Count; i++)
            {
                var text = row[i].ToString();
                output.Append("|" + PadCenter(text,columnsWidths[i] + 2));
            }
            output.Append("|\n");
        }
        return output.ToString();
    }

    private static string PadCenter(string text, int maxLength)
    {
        int diff = maxLength - text.Length;
        return new string(' ', diff/2) + text + new string(' ', (int) (diff / 2.0 + 0.5));

    } 

Answer 3

using(var writer = new StringWriter()) {
    results.WriteXml(writer);
    Console.WriteLine(writer.ToString());
}

当然,这有用性取决于格式化的重要性.如果它只是一个调试转储,我发现这样的XML输出非常易读.但是,如果格式化对您很重要,那么您别无选择,只能编写自己的方法来执行此操作.

Answer 4

你可以使用像这样:

Private Sub PrintTableOrView(ByVal table As DataTable, ByVal label As String)
    Dim sw As System.IO.StringWriter
    Dim output As String

    Console.WriteLine(label)

    ' Loop through each row in the table. '
    For Each row As DataRow In table.Rows
        sw = New System.IO.StringWriter
        ' Loop through each column. '
        For Each col As DataColumn In table.Columns
            ' Output the value of each column's data.
            sw.Write(row(col).ToString() & ", ")
        Next
        output = sw.ToString
        ' Trim off the trailing ", ", so the output looks correct. '
        If output.Length > 2 Then
            output = output.Substring(0, output.Length - 2)
        End If
        ' Display the row in the console window. '
        Console.WriteLine(output)
    Next
    Console.WriteLine()
End Sub

Answer 5

我知道我晚了几年 xD 但这是我是怎么做到的

    public static string convertDataTableToString(DataTable dataTable)
    {
        string data = string.Empty;
        for (int i = 0; i < dataTable.Rows.Count; i++)
        {
            DataRow row = dataTable.Rows[i];
            for (int j = 0; j < dataTable.Columns.Count; j++)
            {
                data += dataTable.Columns[j].ColumnName + "~" + row[j];
                if (j == dataTable.Columns.Count - 1)
                {
                    if (i != (dataTable.Rows.Count - 1))
                        data += "$";
                }
                else
                    data += "|";
            }
        }
        return data;
    }

如果有人对此进行了优化，请告诉我

我试过这个：

    public static string convertDataTableToString(DataTable dataTable)
    {
        string data = string.Empty;
        int rowsCount = dataTable.Rows.Count;
        for (int i = 0; i < rowsCount; i++)
        {
            DataRow row = dataTable.Rows[i];
            int columnsCount = dataTable.Columns.Count;
            for (int j = 0; j < columnsCount; j++)
            {
                data += dataTable.Columns[j].ColumnName + "~" + row[j];
                if (j == columnsCount - 1)
                {
                    if (i != (rowsCount - 1))
                        data += "$";
                }
                else
                    data += "|";
            }
        }
        return data;
    }

但这个答案说它更糟