ASP.NET DataRow的DataRowState概念

2008-06-19

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ASP.NET

今天跟同事在討論DataRowState的問題..去找了一下MSDN...
DataRow有5個State(Added,Deleted,Detached,Modified,Unchanged)
小弟就用範例來說明這幾個狀態....

今天跟同事在討論DataRowState的問題..去找了一下MSDN...

DataRow有5個State(Added,Deleted,Detached,Modified,Unchanged)

小弟就用範例來說明這幾個狀態....

asp.net(c#)

using System;

using System.Data;

using System.Configuration;

using System.Collections;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

public partial class drState : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

//DataRowState有以下幾種State

//Added,Deleted,Detached,Modified,Unchanged

DataTable dt = MakeTable();

DataRow dr;

dr = dt.NewRow();

Response.Write(dr.RowState.ToString() + " 當DataRow建立後,還沒加入DataTable前 ");

dt.Rows.Add(dr);

Response.Write(dr.RowState.ToString() + " 當DataRow加入DataTable後,還沒執行DataTable.AcceptChanges()前 ");

dt.AcceptChanges();

Response.Write(dr.RowState.ToString() + " 當DataRow加入DataTable後,執行DataTable.AcceptChanges()後 ");

dr["FirstName"] = "Scott";

Response.Write(dr.RowState.ToString() + " 當DataTable裡的DataRow修改後,還沒執行DataTable.AcceptChanges()前 ");

dt.AcceptChanges();

Response.Write(dr.RowState.ToString() + " 當DataTable裡的DataRow修改後,執行DataTable.AcceptChanges()後 ");

dr.Delete();

Response.Write(dr.RowState.ToString() + " 當DataTable裡的DataRow刪除後,還沒執行DataTable.AcceptChanges()前 ");

dt.AcceptChanges();

Response.Write(dr.RowState.ToString() + " 當DataTable裡的DataRow刪除後,執行DataTable.AcceptChanges()後 ");

}

private DataTable MakeTable()

{

// Make a simple table with one column.

DataTable table = new DataTable("table");

DataColumn dcFirstName = new DataColumn("FirstName", Type.GetType("System.String"));

table.Columns.Add(dcFirstName);

return table;

}

執行結果：

參考網址：

http://msdn.microsoft.com/en-us/library/system.data.datarow.rowstate.aspx

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