C# 相同/不同的Datatable合并

一、DataTable1和DataTable2结构相同的情况。

private DataTable SetDataTbble(DataTable table1, DataTable table2)
{
    DataTable dataTable = table1.Clone();
    object[] obj = new object[dataTable.Columns.Count];
    for (int i = 0; i < table1.Rows.Count; i++)
    {
        table1.Rows[i].ItemArray.CopyTo(obj, 0);
        dataTable.Rows.Add(obj);
    }
    for (int i = 0; i < table2.Rows.Count; i++)
    {
        table2.Rows[i].ItemArray.CopyTo(obj, 0);
        dataTable.Rows.Add(obj);
    }
    return dataTable;
}

二、DataTable1和DataTable2结构不同相同的情况。

private DataTable UniteDataTable(DataTable dt1, DataTable dt2, string DTName)
{
    DataTable dt3 = dt1.Clone();
    for (int i = 0; i < dt2.Columns.Count; i++)
    {
        dt3.Columns.Add(dt2.Columns[i].ColumnName);
    }
    object[] obj = new object[dt3.Columns.Count];

    for (int i = 0; i < dt1.Rows.Count; i++)
    {
        dt1.Rows[i].ItemArray.CopyTo(obj, 0);
        dt3.Rows.Add(obj);
    }

    if (dt1.Rows.Count >= dt2.Rows.Count)
    {
        for (int i = 0; i < dt2.Rows.Count; i++)
        {
            for (int j = 0; j < dt2.Columns.Count; j++)
            {
                dt3.Rows[i][j + dt1.Columns.Count] = dt2.Rows[i][j].ToString();
            }
        }
    }
    else
    {
        DataRow dr3;
        for (int i = 0; i < dt2.Rows.Count - dt1.Rows.Count; i++)
        {
            dr3 = dt3.NewRow();
            dt3.Rows.Add(dr3);
        }
        for (int i = 0; i < dt2.Rows.Count; i++)
        {
            for (int j = 0; j < dt2.Columns.Count; j++)
            {
                dt3.Rows[i][j + dt1.Columns.Count] = dt2.Rows[i][j].ToString();
            }
        }
    }
    dt3.TableName = DTName; //设置DT的名字
    return dt3;
}