DataSet的初始化构建、定义、赋值、使用、添加（合并）

自定义建表方法DataTable

public  DataTable BuildDataTable(string tablename, params string[] colname)
        {
            DataTable dt = new DataTable();
            dt.TableName = tablename;
            foreach (string col in colname)
            {
                dt.Columns.Add(col,typeof(string));    
            }
            return dt;
        }

DataSet的初始化构建、定义、赋值、使用

var ds = new DataSet("DataSet");
var bdt = new DataTable("DataTable1");
bdt.Columns.Add("Column1");
bdt.Columns.Add("Column2");

var cdt = new DataTable("DataTableA");
cdt.Columns.Add("ColumnA");
cdt.Columns.Add("ColumnB");
cdt.Columns.Add("ColumnC");

for (int i = 0; i < 10; i++)
{
    DataRow bdr = bdt.NewRow();
    bdr["Column1"] = "123";
    bdr["Column2"] = 10;
    bdt.Rows.Add(bdr);

    DataRow cdr = cdt.NewRow();
    cdr["ColumnA"] = "123";
    cdr["ColumnB"] = 10;
    cdr["ColumnC"] = "2230";
    cdt.Rows.Add(cdr);
}

ds.Tables.Add(bdt);
ds.Tables.Add(cdt);
Console.WriteLine(ds.DataSetName);

if (ds.Tables.Count > 0)
{
    for (int i = 0; i < ds.Tables.Count; i++)
    {
        //if (i == 0)
        //    continue;
        if (ds.Tables[i].Columns.Count > 0)
        {
            Console.WriteLine("表名：" + ds.Tables[i].TableName);
            for (int j = 0; j < ds.Tables[i].Columns.Count; j++)
            {
                //if (j == 1)
                //    break;
                Console.WriteLine(ds.Tables[i].Columns[j].ColumnName);
            }
        }
    }
}

输出

DataSet
 表名：DataTable1
   Column1
   Column2
 表名：DataTableA
   ColumnA
   ColumnB
   ColumnC

DataSet的添加或者合并

var a =BuildDataTable("表名1", "字段名1", "字段名2");
a.Rows.Add("字段值1", "字段值2");

var b = new DataSet();
var c = BuildDataTable("表名A", "字段名A");
c.Rows.Add("字段值A");
b.Tables.Add(c);

var danew = new DataSet();
danew.Tables.Add(a);
danew.Merge(b);

Console.WriteLine(danew.Tables[0].Rows[0]["字段名2"].ToString());
Console.WriteLine(danew.Tables["表名A"].Rows[0]["字段名A"]);

输出

字段值2
字段值A

标签：Tables,初始化,DataSet,cdt,Add,ds,Columns,赋值
来源： https://www.cnblogs.com/jiatree/p/16386151.html