關(guān)于GridView使用學(xué)習(xí)總結(jié)
由于Asp.Net視頻比較舊,涉及到的數(shù)據(jù)綁定控件DataGrid在VS20xx中已經(jīng)沒有了,取而代之的是GridView。開始覺得視頻中的例子沒法實現(xiàn)了,其實不然,DataGrid里面的功能GridView里一樣都不少,只是形式變化了一下,仔細(xì)研究一下發(fā)現(xiàn)它們是換湯不換藥啊。
。ㄒ唬〥ataKeyName屬性
。1)DataKeyNames一般都是用來對當(dāng)前行做唯一標(biāo)示的,所以一般為數(shù)據(jù)庫的ID。
。2)GridView.DataKeys[e.RowIndex],e.RowIndex是獲取事件對應(yīng)的行,GridView.DataKeys[e.RowIndex]就是獲取對應(yīng)行的唯一標(biāo)示也就是DataKeyNames所指定列的值。
。3)DataList和Repeater是沒有的該屬性的。
在代碼中這樣使用:(定義的該函數(shù)在下面都需要調(diào)用)
/// 實現(xiàn)數(shù)據(jù)綁定功能 ///
private void BindToDataGird { SqlConnection con = DB.CreateCon; SqlDataAdapter sda = new SqlDataAdapter; sda.SelectCommand = new SqlCommand("select employeeID,FirstName,LastName,Title,BirthDate from employees ", con); DataSet ds = new DataSet; sda.Fill(ds, "emp"); //將查詢到的數(shù)據(jù)添加到DataSet中。 this.GridView1.DataKeyNames =new string{ "employeeID"}; //DataKeyNames的使用 this.GridView1.DataSource = ds.Tables["emp"]; this.DataBind; }
如何取值?
DataKey key = GridView1.DataKeys[e.RowIndex];//其中e為GridViewDelete(或者Edit)EventArgs e string empID = key[0].ToString;
。ǘ┓猪
由于GridView中封裝了分頁的功能。這里實現(xiàn)起來很容易。先需要設(shè)置屬性:AllowPaging/PageSize/PageSetting。然后編寫事件代碼:
protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e) { this.GridView1.PageIndex = e.NewPageIndex; this.BindToDataGird; }
。ㄈ┡判
首先設(shè)置AllowSorting屬性為true.事件代碼:
protected void GridView1_Sorting(object sender, GridViewSortEventArgs e) { if (ViewState["order"] == null) //使用ViewState設(shè)置雙向排序。 { ViewState["order"] = "ASC"; } else { if (ViewState["order"].ToString == "ASC") { ViewState["order"] = "DESC"; } else { ViewState["order"] = "ASC"; } } //數(shù)據(jù)綁定顯示 SqlConnection con = DB.CreateCon; SqlDataAdapter sda = new SqlDataAdapter; sda.SelectCommand = new SqlCommand("select employeeID,FirstName,LastName,Title,BirthDate from employees ", con); DataSet ds = new DataSet; sda.Fill(ds, "emp"); ds.Tables["emp"].DefaultView.Sort = e.SortExpression + " " + ViewState["order"].ToString; //設(shè)置排序 this.GridView1.DataSource = ds.Tables["emp"].DefaultView; //將表的默認(rèn)視圖作為數(shù)據(jù)源。 this.DataBind; }
。ㄋ模﹦h除
這里需要注意一點:就是獲取某一行的主鍵值。
protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e) { DataKey key = GridView1.DataKeys[e.RowIndex]; string empID = key[0].ToString; SqlConnection con = DB.CreateCon; SqlCommand cmd = new SqlCommand(" from employees where employeeID= +empID+" , con); con.Open; cmd.ExecuteNonQuery; this.BindToDataGird; }
。ㄎ澹┚庉嫞ǜ潞腿∠
protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e) { this.GridView1.EditIndex = e.NewEditIndex; this.BindToDataGird; } protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e) { this.GridView1.EditIndex = -1; //設(shè)置索引值為負(fù)取消編輯。 this.BindToDataGird; } protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e) { DataKey key = GridView1.DataKeys[e.RowIndex]; string empID = key[0].ToString; string lastName=((TextBox)(GridView1.Rows [e.RowIndex ] .Cells [2].Controls [0])).Text ; //將GridView中某列中控件強制轉(zhuǎn)換為TextBox,然后取出它的值。 Response.Write(empID +"&" + lastName ); //用于測試。 this.GridView1.EditIndex = -1; this.BindToDataGird; }
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