我只是嘗試通過school.name的名稱搜索結果，但網格視圖沒有顯示任何東西

Question

這是我的代碼...我只是嘗試搜索結果的名稱school.but網格視圖沒有顯示任何thing.my代碼

public void gridfill() 
{ 
    markSp spMark = new markSp(); 
    DataTable dtbl = new DataTable(); 
    dtbl = spMark.markViewAll(); 
    gvResult.DataSource = dtbl; 
    dtbl = spMark.markViewBySchool(txtSchoolName.Text); 
    gvResult.DataSource = dtbl;  
} 
protected void Button1_Click(object sender, EventArgs e) 
{ 
    gridfill(); 
} 
public DataTable markViewAll() 
{ 
    DataTable dtbl = new DataTable(); 
    SqlDataAdapter sqlda = new SqlDataAdapter("markViewAll", sqlcon); 
    sqlda.SelectCommand.CommandType = CommandType.StoredProcedure; 
    sqlda.Fill(dtbl); 
    return dtbl; 
} 
public DataTable markViewBySchool(string viewBySchool) 
{ 
    DataTable dtbClass = new DataTable(); 
    SqlDataAdapter sqlda = new SqlDataAdapter("markViewBySchool",sqlcon); 
    sqlda.SelectCommand.CommandType = CommandType.StoredProcedure; 
    sqlda.SelectCommand.Parameters.Add("@schoolName", SqlDbType.VarChar).Value = viewBySchool; 
    sqlda.Fill(dtbClass); 
    return dtbClass; 
} 

Answer 1

如下的變化，也有你的代碼一些問題，爲什麼兩次數據綁定相同的GridView？即使你的數據綁定了兩次，它也只顯示你上次設置的內容。我已刪除的幾行代碼，你忘了打電話給gvResult.DataBind()以及

public void gridfill() 
{ 
    markSp spMark = new markSp(); 
    gvResult.DataSource = spMark.markViewBySchool(txtSchoolName.Text); 
    gvResult.DataBind(); 
} 

Answer 2

既然你已經標記與ASP.Net，你需要調用DataBind

gvResult.DataBind(); 

所以，你的方法是：

public void gridfill() 
{ 
    markSp spMark = new markSp(); 
    DataTable dtbl = new DataTable(); 
    dtbl = spMark.markViewAll(); //you are not using this anywhere 
    gvResult.DataSource = dtbl; // so you can get rid of these two lines 
    dtbl = spMark.markViewBySchool(txtSchoolName.Text); 
    gvResult.DataSource = dtbl;  
    gvResult.DataBind(); // This is missing 
} 

您應該看到：ASP.NET data binding overview

Answer 3

public void gridfill() 
{ 
     markSp spMark = new markSp(); 
    DataTable dtbl = new DataTable(); 
    dtbl = spMark.markViewAll(); 

    dtbl = spMark.markViewBySchool(txtSchoolName.Text); 
    gvResult.DataSource = dtbl; 
    gvResult.Databind(); // You forgot DataBind() 
    }