Published:
07 Oct 2003
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Abstract
Have you ever wondered how to edit the web.config file? This article will continue from Part 1 and discuss some more advanced techniques of editing a custom config file.
Tested: ASP.NET 1.0, ASP.NET 1.1
Included: Examples |
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by Jason N. Gaylord
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| Before We Begin |
Note: This is a continuation of a previous article. You can view the first part by clicking here |
| Section 1: Setting Up The Web.Config File |
Now that we know how to edit basic properties in the web.config, let's create some custom properties. For this example, I have added two custom nodes as shown below:
EditConfig.aspx
**************************************************
<configuration>
<appSettings>
<add key="conUser" Value="sa">
<add key="conServer" value="localhost">
</appSettings>
</configuration>
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| Section 2: Prepare Our Page |
We will target the server node for this example. We will setup our page to include a few servers in a drop-down like the previous section demonstrated. We will add values of 'Server01', 'Server02', and 'Server03'. After adding these, our code should look like this:
EditConfig.aspx
**************************************************
1: <%@ Page Language="vb" %>
2: <%@ import Namespace="System" %>
3: <%@ import Namespace="System.Xml" %>
4: <script runat="server">
5:
6: Sub Page_Load(s as Object, e as EventArgs)
7: Dim myConfig As New XmlDocument()
8:
9: myConfig.Load("C:\InetPub\wwwroot\web.config")
10:
11: If not isPostBack then
12: Dim myCurrentValue as String
13: Dim myListItem as ListItem
14:
15: myCurrentValue = myConfig.SelectSingleNode(
"configuration/appSettings/add[@key='conServer']
/@value").Value
16: myListItem = node01.Items.FindByText(myCurrentValue)
17:
18: node01.SelectedIndex = node01.Items.IndexOf(myListItem)
19: Else
20: 'We will save this for later!
21: End If
22:
23: End Sub
24:
25: </script>
26: <html>
27: <head>
28: <title>Web.config Editor</title>
29: </head>
30: <body>
31: <form runat="server">
32: <asp:Label id="title01" runat="server" text="Change Server:" />
33: <asp:DropDownList id="node01" runat="server">
34: <asp:ListItem Value="localhost" text="localhost" />
35: <asp:ListItem Value="Server01" text="Server01" />
36: <asp:ListItem Value="Server02" text="Server02" />
37: <asp:ListItem Value="Server03" text="Server03" />
38: </asp:DropDownList>
39: <br />
40: </form>
41: </body>
42: </html>
Notice how the SelectSingleNode option changed. We are now using a parameter to select which 'add' node we want to use. Think of this as a SELECT SQL statement. We are selecting the node where 'key' is equal to 'conServer'. The attribute of the node is assigned by using the ampersand(@) symbol. Then, the value you want to select is placed inside single quotes('). Finally, the entire statement is placed in between brackets([ and ]). |
| Section 3: Implementing The Page |
Then, we will use the same concept as Part 1 to save the node. This time we will use the a parameter to select which 'add' node we want to update.
EditConfig.aspx
**************************************************
1: <%@ Page Language="vb" %>
2: <%@ import Namespace="System" %>
3: <%@ import Namespace="System.Xml" %>
4: <script runat="server">
5:
6: Sub Page_Load(s as Object, e as EventArgs)
7: Dim myConfig As New XmlDocument()
8:
9: myConfig.Load("C:\InetPub\wwwroot\web.config")
10:
11: If not isPostBack then
12: Dim myCurrentValue as String
13: Dim myListItem as ListItem
14:
15: myCurrentValue = myConfig.SelectSingleNode(
"configuration/appSettings/add[@key='conServer']
/@value").Value
16: myListItem = node01.Items.FindByText(myCurrentValue)
17:
18: node01.SelectedIndex = node01.Items.IndexOf(myListItem)
19: Else
20: 'We will save this for later!
21: End If
22:
23: End Sub
24:
25: Sub Button_Click(s as Object, e as EventArgs)
26: Dim myConfig As New XmlDocument()
27: Dim myAttribute As XmlAttribute
28:
29: myConfig.Load("C:\InetPub\wwwroot\web.config")
30:
31: myAttribute = myConfig.SelectSingleNode(
"configuration/appSettings/add[@key='conServer']
/@value")
32: myAttribute.Value = node01.SelectedItem.ToString()
33:
34: myConfig.Save("C:\InetPub\wwwroot\web.config")
35: End Sub
36:
37: </script>
38: <html>
39: <head>
40: <title>Web.config Editor</title>
41: </head>
42: <body>
43: <form runat="server">
44: <asp:Label id="title01" runat="server" text="Change Server:" />
45: <asp:DropDownList id="node01" runat="server">
46: <asp:ListItem Value="localhost" text="localhost" />
47: <asp:ListItem Value="Server01" text="Server01" />
48: <asp:ListItem Value="Server02" text="Server02" />
49: <asp:ListItem Value="Server03" text="Server03" />
50: </asp:DropDownList>
51: <br />
52: <asp:Button id="myButton" runat="server" Text="Update"
OnClick="Button_Click" />
53: </form>
54: </body>
55: </html>
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User Comments
Title:
Creating a Web.config Editor - Part 2
Name:
Kris Triyantio
Date:
2007-01-16 11:09:18 PM
Comment:
It's good, but i cannot save. it shown error message.
"access denied"
how can i handle that.
Thanks
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Title:
Creating a Web.config Editor - Part 2
Name:
Haroldo Carvalho
Date:
2006-02-01 9:58:14 AM
Comment:
Very good.
It realy helpped me.
Thanks
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