[英]How do I access controls from the parent page from within an ASP.NET User Control?
[英]How do I access a control from a different page within my site?
或者也許我不需要,我不知道。 這就是我想要做的。 我在一個頁面上有一個gridview,當我單擊一個項目時,它獲取ID並將其鏈接到另一頁,該頁面顯示了與該項目一起在gridview中的所有信息。 在第二頁上,我希望能夠將帶有一些文本的照片插入數據庫,但是我要確保插入的照片帶有正確的blogID(在第一頁上單擊)。 到目前為止,這是我的代碼:
EditBlogPosts.aspx
<asp:GridView ID="GridView1" runat="server" AllowSorting="True"
AutoGenerateEditButton="True"
DataSourceID="AccessDataSource1"
AutoGenerateColumns="False" DataKeyNames="ID"
AlternatingRowStyle-BackColor="Gray"
AlternatingRowStyle-CssClass="editGridFormat" RowStyle-CssClass="editGridFormat"
RowStyle-VerticalAlign="Top"
onselectedindexchanged="GridView1_SelectedIndexChanged">
后面的代碼:
protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
GridViewRow row = GridView1.SelectedRow;
Response.Redirect("~/EditThisPost.aspx?ID=" + row.Cells[2].Text);
}
EditThisPost.aspx
<asp:FormView ID="Formview1" runat="server" DefaultMode="Insert" DataSourceID="AccessDataSource1" >
<InsertItemTemplate>
<br />
<asp:Label ID="TextforPhotoLabel" runat="server" Text="Put your text to go with your photo here:" /><br />
<asp:TextBox ID="PhotoText" runat="server" Rows="10" Columns="100" /><br /><br />
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Label ID="UploadStatusLabel" runat="server" Text="Status: " /><br />
<asp:Button ID="UploadButton" runat="server" OnClick="UploadFile" Text="Insert Item" /><br />
</InsertItemTemplate>
</asp:FormView>
后面的代碼(特別注意我聲明為int blogID的行):
protected void UploadFile(object sender, EventArgs e)
{
TextBox txtPhotoText = (TextBox)Formview1.FindControl("PhotoText");
FileUpload FileUpload1 = (FileUpload)Formview1.FindControl("FileUpload1");
Label UploadStatusLabel = (Label)Formview1.FindControl("UploadStatusLabel");
if (FileUpload1.HasFile)
{
try
{
if (FileUpload1.PostedFile.ContentType == "image/jpeg")
{
if (FileUpload1.PostedFile.ContentLength < 10240000)
{
string filename = Path.GetFileName(FileUpload1.FileName);
FileUpload1.SaveAs(Server.MapPath("~/photos/PeoplePhotos/") + filename);
UploadStatusLabel.Text = "Upload status: Complete!";
string constr = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\TravelJoansDB.mdb;";
string cmdstr = "INSERT INTO BlogEntryItems (BlogID, Picture, PicText1) VALUES (?,?,?)";
int blogID = int.Parse(Request.QueryString["ID"]);
OleDbConnection con = new OleDbConnection(constr);
OleDbCommand com = new OleDbCommand(cmdstr, con);
con.Open();
com.Parameters.AddWithValue("@BlogID", blogID);
com.Parameters.AddWithValue("@Picture", filename);
com.Parameters.AddWithValue("@PicText1", txtPhotoText);
com.ExecuteNonQuery();
con.Close();
}
else
UploadStatusLabel.Text = "Upload status: The file has to be less than 10 MB!";
}
else
UploadStatusLabel.Text = "Upload status: Only JPEG files are accepted!";
}
catch (Exception ex)
{
UploadStatusLabel.Text = "Upload status: The file could not be uploaded. The following error occured: " + ex.Message;
}
}
}
我非常感謝您的幫助。 我以為我可以某種方式獲取傳遞的ID,以使“〜\\ EditThisPost.aspx?ID =“成為有效的鏈接。 但是,如果有更好的方法來做,或者甚至我所想的方法都不存在,那么我該如何完成我所需要的?
你可以得到如下的blogID
int blogID = int.Parse(Request.QueryString["ID"]);
我將使用int.TryParse
來避免查詢字符串中非整數值的情況下的異常
int blogID;
int.TryParse(Request.Querystring["ID"], out blogID);
將一個Viewstate支持的屬性添加到EditThisPost.aspx以保存BlogID:-
http://www.codingwith.net/2008/01/viewstate-backed-properties-part-one.html
在EditThisPost.aspx的PageLoad中設置此屬性,然后在UploadFile中使用它。
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