過濾結果在ASP.NET Web窗體

Question

我試圖通過在網頁表單的教程走了，我嘗試過濾的搜索結果是不工作很正確：

的ASP頁面樣子的內容這樣的：

<form id="form1" runat="server"> 

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> 
<asp:Button ID="button1" runat="server" onclick="button1_Click" Text="Submit" /> 
<asp:GridView ID="GridView1" AllowPaging="true" PageSize="8" AutoGenerateColumns="false" runat="server" 
OnPageIndexChanging="GridView1_PageIndexChanging"> 

    <Columns> 
     <asp:BoundField HeaderText="Qual ID" DataField="ID" /> 
     <asp:BoundField HeaderText="Client Name" DataField="Client_Name" /> 
     <asp:BoundField HeaderText="Project" DataField="Project_Name" /> 
     <asp:BoundField HeaderText="Uploaded By" DataField="Uploaded_By" /> 
    </Columns> 

</asp:GridView> 
</form> 

而且隱藏文件中的代碼：

public partial class Sample1 : System.Web.UI.Page 
{ 
protected void Page_Load(object sender, EventArgs e) 
{ 

    SourceDataContext db = new SourceDataContext(); 

    GridView1.DataSource = from q in db.Cust 
          orderby q.ID 
          select q; 
    GridView1.DataBind(); 
} 

protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e) 
{ 
    GridView1.PageIndex = e.NewPageIndex; 

    GridView1.DataBind(); 
} 
protected void button1_Click(object sender, EventArgs e) 
{ 
    string client = TextBox1.Text; 

    SourceDataContext db = new SourceDataContext(); 

    GridView1.DataSource = from q in db.Cust 
          where q.Client_Name == client 
          orderby q.ID 
          select q; 
    GridView1.DataBind(); 

} 
} 

過濾作品，雖然它的尋呼停止工作。任何建議感激。

謝謝。

Answer 1

在我看來，有在!IsPostBack

GridView1_PageIndexChangingPage_Load圍約束力不要再結合

通過Chris Gessler

代碼

看到抓兩個問題

1. public partial class Sample1 : System.Web.UI.Page 
   { 
   protected void Page_Load(object sender, EventArgs e) 
   { 
       if(!IsPostBack) 
       { 
   
       SourceDataContext db = new SourceDataContext(); 
   
       GridView1.DataSource = from q in db.Cust 
             orderby q.ID 
             select q; 
       GridView1.DataBind(); 
       } 
   } 
   
   protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e) 
   { 
       GridView1.PageIndex = e.NewPageIndex; 
   
   
   } 
   protected void button1_Click(object sender, EventArgs e) 
   { 
       string client = TextBox1.Text; 
   
       SourceDataContext db = new SourceDataContext(); 
   
       GridView1.DataSource = from q in db.Cust 
             where q.Client_Name == client 
             orderby q.ID 
             select q; 
       GridView1.DataBind(); 
       GridView1.PageIndex = 0; 
   
   } 
   } 
   

Answer 2

問題1：這應該只在GET請求上運行。 ViewState將接管PostBacks並填充網格。

protected void Page_Load(object sender, EventArgs e) 
{ 
    if(!this.Page.IsPostback) 
    { 
     SourceDataContext db = new SourceDataContext(); 

     GridView1.DataSource = from q in db.Cust 
           orderby q.ID 
           select q; 
     GridView1.DataBind(); 
    } 
} 

問題2：您需要重置頁索引，因爲記錄集更改。當前頁面可能不存在。

protected void button1_Click(object sender, EventArgs e)  
{  
    string client = TextBox1.Text;  

    SourceDataContext db = new SourceDataContext();  

    GridView1.DataSource = from q in db.Cust  
          where q.Client_Name == client  
          orderby q.ID  
          select q;  
    GridView1.DataBind();  

    GridView1.PageIndex = 0; 

} 

問題3：您正在調用DataBind（），但未設置新的數據源。

protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)    
{    
    GridView1.PageIndex = e.NewPageIndex;       
} 

此外，

考慮緩存記錄和過濾，與其向服務器喊出了一個新的記錄，但是，這取決於「需求」。緩存記錄集顯然不會找到任何新記錄，這可能不符合您的業務需求。

考慮設置在你的代碼中的事件OnInit方法背後：

protected void Page_Init(object sender, EventArgs e) 
{ 
    this.GridView1.PageIndexChanging += GridView1_PageIndexChanging; 
}