如何从aspx.cs文件中设置变量值aspx文件在asp.net? [英] how to set variable value from aspx.cs file to aspx file in asp.net?
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问题描述
I codeD为
public partial class Necklace : System.Web.UI.Page
{
protected int PageId;
protected void Page_Load(object sender, EventArgs e)
{
PageId = 12;
}
}
和我Image.aspx文件codeD为
AND I coded in Image.aspx file as
<div>
<asp:image ToolTip = "ASP Image Control" ID="Image1" runat="server" ImageUrl ="ImageCSharp.aspx?ImageID=<%= PageId %>" ></asp:image></div>
和我ImageCSharp.aspx.cs文件codeD为
And I coded in ImageCSharp.aspx.cs file as
protected void Page_Load(object sender, EventArgs e)
{
if (Request.QueryString["ImageID"] != null)
{
string strQuery = "select ImageName , ImageData from ImageTable where id=@id"; //,Category
SqlCommand cmd = new SqlCommand(strQuery);
cmd.Parameters.Add("@id", SqlDbType.Int).Value = Convert.ToInt32(Request.QueryString["ImageID"]);
DataTable dt = GetData(cmd);
if (dt != null)
{
Byte[] bytes = (Byte[])dt.Rows[0]["ImageData"];
Response.Buffer = true;
Response.Charset = "";
Response.Cache.SetCacheability(HttpCacheability.NoCache);
//Response.ContentType = dt.Rows[0]["Category"].ToString();
Response.AddHeader("content-disposition", "attachment;filename=" + dt.Rows[0]["ImageName"].ToString());
Response.BinaryWrite(bytes);
Response.Flush();
Response.End();
}
}
}
private DataTable GetData(SqlCommand cmd)
{
DataTable dt = new DataTable();
String strConnString = System.Configuration.ConfigurationManager.ConnectionStrings["conString"].ConnectionString;
SqlConnection con = new SqlConnection(strConnString);
SqlDataAdapter sda = new SqlDataAdapter();
cmd.CommandType = CommandType.Text;
cmd.Connection = con;
try
{
con.Open();
sda.SelectCommand = cmd;
sda.Fill(dt);
return dt;
}
catch
{
return null;
}
finally
{
con.Close();
sda.Dispose();
con.Dispose();
}
}
}
请帮助我如何code的的ImageUrl =ImageCSharp.aspx ImageID = &LT;%=的PageId%> 的正确...的PageId应变量。
Please help me how to code ImageUrl ="ImageCSharp.aspx?ImageID=<%= PageId %>" correctly... PageId should be variable.
推荐答案
只需设置它的背后code:
Just set it in code behind:
protected int PageId;
protected void Page_Load(object sender, EventArgs e)
{
PageId = 12; // some value
Image1.ImageUrl ="ImageCSharp.aspx?ImageID=" + PageId;
}
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