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[英]how to store post variable so i can call the variable anytime in ASP.NET
[英]Store text as variable then call in ASP.net
我正在使用dropdownlist和復選框來制作自定義的gridview。 復選框代表數據庫中要調用的列。 我的代碼隱藏文件是創建一個自定義的SQL查詢,我將該查詢返回給asp:DqlDataSource ... SelectCommand =“”
截至目前,我正在嘗試將消息存儲到(查詢)到變量中,這是我目前遇到的問題...
<asp:DropDownList ID="DDL" runat="server" DataSourceID="SqlDataSource1"
DataTextField="Fullname" DataValueField="Employee_ID" AutoPostBack="true">
</asp:DropDownList>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:DBConnectionString %>"
SelectCommand="@Query">
</asp:SqlDataSource>
<asp:CheckBox ID="Address" Text="Address" runat="server" />
<asp:CheckBox ID="Phone" Text="Phone" runat="server" />
<asp:CheckBox ID="Email" Text="Email" runat="server" />
<asp:Button ID="ButtonID" onclick="Create" runat="server" Text="Submit" />
<br />
<br />
<br />
<br />
<asp:Label ID="Label1" runat="server" Text=""></asp:Label> -
<asp:Label ID="Label2" runat="server" Text=""></asp:Label> -
<asp:Label ID="Label3" runat="server" Text=""></asp:Label> -
<asp:Label ID="Label4" runat="server" Text=""></asp:Label> -
<br />
<asp:Label ID="Label5" runat="server" Text=""></asp:Label>
<asp:GridView ID="GridView1" runat="server">
</asp:GridView>
=======================代碼隱藏========================== =
protected void Create(object sender, System.EventArgs e)
{
string a = "";
string b = "";
string c = "";
string d = "";
if (DDL.SelectedValue == "Select")
{
return;
}
else
{
a = DDL.SelectedValue;
}
if (Address.Checked == true)
{
b = "Address,";
}
if (Phone.Checked == true)
{
c = "Phone,";
}
if (Email.Checked == true)
{
d = "Email,";
}
Label1.Text = a;
Label2.Text = b;
Label3.Text = c;
Label4.Text = d;
string Query = ("SELECT" b c d "FROM Employee WHERE Employee_ID =" a);
}
您正在尋找String級聯嗎?
嘗試使用此:
string Query = String.Format("SELECT {0} {1} {2} FROM Employee WHERE Employee_ID ={3}",b,c,d,a);
您遇到的問題到底是什么?
我猜您在運行該查詢時遇到了問題,因為它在FROM
之前會有一個逗號。 保留要搜索的字段的一種更好的方法可能是將值推入單個數組中,然后遍歷數組的內容並用逗號分隔每個字段。 這樣,您的字段列表可以增長和縮小到任意大小,而不必擔心空值。 您可能還需要考慮將“ a”值包裝在單引號中(假設您正在讀取字符串...)
舊代碼:
string Query = ("SELECT" b c d "FROM Employee WHERE Employee_ID =" a);
結果: *選擇地址,電話,電子郵件,從雇員那里雇員ID =鮑勃·瓊斯*
新代碼:
string Query = "SELECT " + String.Join(", ", arrFields) + " FROM Employee WHERE Employee_ID = '" + a + "'"
結果: *選擇來自員工的地址,電話,電子郵件WHERE Employee_ID ='Bob Jones'*
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