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Is it possible to overload HttpResponse and configure a website to use the derived class rather than HttpResponse? If so, where would the configuration go?
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HttpResponse is a class, not a method; classes cannot be overloaded. Nor can it be replaced easily: it is flagged as not inheritable.
Depending on what you want done, you might be able to create a wrapper class. You can obtain a reference to the current Response object through System.Web.HttpContext.Current.Response. Write what methods you need, then call your wrapper instead of Response. If you want to override methods like Write, you will need to write custom code that either reformats the text before passing it to Response or write your own custom text outputter.
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I didn't notice the class was sealed. Bummer, I was hoping there was a factory that I could configure in web.config to return a custom type instead. Thanks for your help.
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Hey guys,
I am new to C# and know very little about ASP.net and classes in general. All that to say I got a project file for Visual Studio 2008 that is a C# web form that is suppose to allow you to enter address info: Street, City, State and Zip and then in a text box below shows that info in a mailing address format, e.g.
123 Easy St.
Anytown CA, 98541
Anyway its got other classes in it and the webform .cs file has nothing in it. I was wondering why they did not use the .cs file from the web form also it has lots of errors in it, I guess because it can't connect the proper classes. In fact if I run as is it says:
"'ASP.default_aspx' does not contain a definition for 'btnGetAddress_Click' and no extension method 'btnGetAddress_Click' accepting a first argument of type 'ASP.default_aspx' could be found (are you missing a using directive or an assembly reference?) C:\Users\Jordan McGehee\Desktop\AddressApp\Default.aspx 59
Why will it not run? Also can it be simplified using the web form (default) class? I am trying to get to know ASP.net but don't have a lot of direction.
Here is the .aspx code for the form itself, if you need the project file I can e-mail to you I didn't see a place to put attachments:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<style type="text/css">
.style1
{
width: 100%;
}
.style2
{
width: 128px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<table class="style1">
<tr>
<td class="style2">
Street:</td>
<td>
<asp:TextBox ID="txtStreet" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td class="style2">
City:</td>
<td>
<asp:TextBox ID="txtCity" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td class="style2">
State:</td>
<td>
<asp:TextBox ID="txtState" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td class="style2">
Zip Code:</td>
<td>
<asp:TextBox ID="txtZipCode" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td class="style2">
</td>
<td>
<textarea id="txtAddressArea" cols="20" name="S1" readonly="readonly" rows="2"></textarea></td>
</tr>
<tr>
<td class="style2">
<asp:Button ID="btnGetAddress" runat="server" onclick="btnGetAddress_Click"
Text="Get Address" />
</td>
<td>
<asp:Button ID="btnClear" runat="server" Text="Clear" />
</td>
</tr>
</table>
</form>
</body>
</html>
And here is the code for the Address Class:
using System;
using System.Collections.Generic;
using System.Text;
namespace AddressApp
{
class Address
{
private string street;
private string city;
private string state;
private string zipcode;
public string getStreet()
{
return street;
}
public void setStreet(string street)
{
this.street = street;
}
public string getCity()
{
return city;
}
public void setCity(string city)
{
this.city = city;
}
public string getState()
{
return state;
}
public void setState(string state)
{
this.state = state;
}
public string getZipCode()
{
return zipcode;
}
public void setZipCode(string zipcode)
{
this.zipcode = zipcode;
}
}
}
and a frmAddress class:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace AddressApp
{
public partial class frmaddress : Form
{
public frmaddress()
{
InitializeComponent();
}
private void btnGetAddress_Click(object sender, EventArgs e)
{
addaddress();
}
public void addaddress()
{
txtareaaddress.Text = "";
Address a = new Address();
a.setStreet(txtStreet.Text);
a.setCity(txtCity.Text);
a.setState(txtState.Text);
a.setZipCode(txtZipCode.Text);
txtareaaddress.AppendText(a.getStreet());
txtareaaddress.AppendText(".");
txtareaaddress.AppendText(Environment.NewLine);
txtareaaddress.AppendText(a.getCity());
txtareaaddress.AppendText(" ");
txtareaaddress.AppendText(",");
txtareaaddress.AppendText(a.getState());
txtareaaddress.AppendText(" ");
txtareaaddress.AppendText(a.getZipCode());
}
private void btnClear_Click(object sender, EventArgs e)
{
ClearControls();
}
public void ClearControls()
{
txtStreet.Text = "";
txtZipCode.Text = "";
txtCity.Text = "";
txtState.Text = "";
txtareaaddress.Text = "";
}
}
}
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Yes, you are correct there should be a code behind file to support this page. These attributes, CodeFile="Default.aspx.cs" Inherits="_Default", are telling the compilation engine where to look for the event definitions and other pieces. Since it isn't there you are getting the error.
The frmAddress class can't be used in here because it is a Windows form, not a webform.
I'd advise throwing this example away. Whomever pointed you to it as a learning project was not very kind to you. Look here, http://www.asp.net/[^], for some better starter examples.
I know the language. I've read a book. - _Madmatt
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Is the "Address" class good to use, if so how do I connect the class from the webform and the class of the "Address" class?
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Although there is nothing wrong technically with the address class, it is a very poor example. The use of getter and setter methods rather than properties is poor design and shows little understanding of .NET. As I said before, throw this example code away and don't listen to the person who recommended it.
This example makes use of .net automatic properties, i.e. no backing field
public class Address
{
public string Street{ get; set; }
...
}
This example uses a backing field
public class Address
{
private string m_Street;
public string Street
{
get{ return m_Street; }
set{ m_Street = value; }
}
}
I know the language. I've read a book. - _Madmatt
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Hi, I have a matrix on RDLC report viewer as following:
C1 C2 Total
Cnt % Cnt % Cnt %
R1 20 30 50
R2 50 50 100
Total 70 80 150
The Subtotal values in column and row are auto-calculated by the matrix object.
How can I access the subtotal value 70, 80, 150 to calculate the % values?
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You can use the group names in totals to calculate.
You could do something like - matrixcoltotal / matrixtotal.
Your expression will look something like this. =Sum(Fields!ReportField.Value,"MatrixGroup")/Sum(Fields!ReportField.Value,"dataset").
Using fields as a real example...
Assuming the name of the column group is WeekStartDate, something like the following should work:
=iif(iif(isnothing(Sum(Fields!RMAs.Value,"WeekStartDate")),0,Sum(Fields!RMAs.Value)/Sum(Fields!RMAs.Value,"WeekStartDate"))=0,nothing,Sum(Fields!RMAs.Value)/Sum(Fields!RMAs.Value,"WeekStartDate"))
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I would like to explain my project for you to understand my problem for your support
I am developing a web application asp.net / c # which manages the data center technical inspection of vehicle, what I would like to do is display a list of centers in a gridview and when I double click a row in gridview another page is displayed that contains the information center clicked.
how can I do this??
thank you
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And what part are you having difficulties with? Honestly, there is so much information available from a cursory search on the term gridview you should have no difficulties.
I know the language. I've read a book. - _Madmatt
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the difficulty is in the redirect when I double click on a line, I failed to do that, here is my gridview code click :
protected void GridView1_RowDataBound1(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
e.Row.Attributes["onmouseover"] = "this.style.cursor='hand';this.style.textDecoration='underline';this.style.background='#FFF5E6'";
e.Row.Attributes["onmouseout"] = "this.style.textDecoration='none';this.style.background='none'";
e.Row.Attributes["onclick"] = ClientScript.GetPostBackClientHyperlink(this, "Select$" + e.Row.RowIndex);
}
}
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There is no native double-click event, and in fact, you are only using the click event.
What is happening? Are you not getting the postback at all? Rather than try a posback why not use a hyperlink to the page?
Also, you should use CSS classes rather than hard coding your styles. I'd also investigate JQuery for some of this. You can get almost the same functionality without the weight of the ASP.NET gridview.
I know the language. I've read a book. - _Madmatt
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Checkout this article from Microsoft, it might be a bit of overkill for your first application, but it gives you a starting point. (maybe)
Gridview Master / detail tutorial[^]
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How to get the current theme from within a UserControl ?
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Hi,
you mean like just the Name of the Pages' Theme?
Within your UserControl, use
this.Page.Theme
to get or set the theme.
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Hi,
DeleteImageUrl is an exposed property of the user control.
public string DeleteImageUrl
{
get { return m_strDeleteImageUrl; }
set { m_strDeleteImageUrl = string.Format("~/App_Themes/{0}/{1}", this.Page.Theme, value); }
}
this.Page is null here. Why ?
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Has the UserControl been correctly added to a page before you set that property? When do you access
the property? Is the control dynamically added or in markup?
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I placed the following line in a .skin file.
<UC:MultiFileUpload runat="server" UpperLimit="10" Rows="5" ListItemHoverColor="#F2D76A" DeleteImageUrl="Img/Delete.png" />
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Ah, i see. You're working with skins and want the delete-image-url of your usercontrol to
point to the correct image file of the current theme?
Maybe the answer in
this thread helps you?
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Correct. I followed your link, but I cann't see any answers.
Basically what I do is the following:
On the Page_Load event of the user control I inject javascript.
ScriptManager.RegisterStartupScript(this, typeof(Page), "MultiFileUploadScript", GetJavaScript(), false);
private string GetJavaScript()
{
StringBuilder JavaScript = new StringBuilder();
:
JavaScript.Append("var deleteImage = null;\n");
if (m_strDeleteImageUrl != string.Empty)
{
JavaScript.Append("deleteImage = new Image();\n");
JavaScript.AppendFormat("deleteImage.src = '{0}';\n", m_strDeleteImageUrl);
JavaScript.AppendFormat("deleteImage.setAttribute('alt','{0}');\n", m_strDeleteText);
}
:
return JavaScript.ToString();
}
How can I make m_strDeleteImageUrl point to the correct theme image ?
tia
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Can't you just set the images' filename (or subpath below the themefolder) in the setter
of the DeleteImageUrl property of your usercontrol (without the string.format(..theme...) part)?
Then, in the GetJavaScript() Method (which you call during Page-Load), you can build the correct path including the theme-folder by using Page.Theme, as Page should not be
null there.
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I already tried that. Even in the JavaScript method Page.Theme is null.
Could it have to do the way I set my theme. In web.config I do :
<pages styleSheetTheme="Sunset">
<controls>
:
</controls>
</pages>
tia
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Oh yes, use Page.StyleSheetTheme instead.
I really hope, the Page property of your control is not null..otherwise.. could you provide a sample project where it is not working?
Cheers
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