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Display Default Content If No QueryString Provided
Posted on 2009-05-13
Hi,
I have a query that takes data (articles) from a database and displays them on the page. If someone visits Page.aspx?id=1 they will see article 1. My problem is I want to display some default content such as a list of articles on Page.aspx or, if someone just manually removes the query string from the URL. I used to do this all the time in PHP/MySQL but don't know how to do it in ASP.NET C#. The code provided shows where I am up to. I did this with the "Configure Data Source".
Thanks,
Keith
I have a query that takes data (articles) from a database and displays them on the page. If someone visits Page.aspx?id=1 they will see article 1. My problem is I want to display some default content such as a list of articles on Page.aspx or, if someone just manually removes the query string from the URL. I used to do this all the time in PHP/MySQL but don't know how to do it in ASP.NET C#. The code provided shows where I am up to. I did this with the "Configure Data Source".
Thanks,
Keith
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
DataSourceID="SqlDataSource1">
<Columns>
<asp:BoundField DataField="C_ID" HeaderText="C_ID" SortExpression="C_ID" />
<asp:BoundField DataField="C_Name" HeaderText="C_Name"
SortExpression="C_Name" />
<asp:BoundField DataField="C_Title" HeaderText="C_Title"
SortExpression="C_Title" />
<asp:BoundField DataField="C_Category" HeaderText="C_Category"
SortExpression="C_Category" />
<asp:BoundField DataField="C_Author" HeaderText="C_Author"
SortExpression="C_Author" />
<asp:BoundField DataField="C_Content" HeaderText="C_Content"
SortExpression="C_Content" />
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
SelectCommand="SELECT [C_ID], [C_Name], [C_Title], [C_Category], [C_Author], [C_Content] FROM [SJCS_Content] WHERE ([C_Name] = @C_Name)">
<SelectParameters>
<asp:QueryStringParameter Name="C_Name" QueryStringField="id" Type="String" />
</SelectParameters>
</asp:SqlDataSource>
<br />
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11 Comments
in your page load you could check for the existance of the querystring parameter and redirect to another page if its not there:
if (Request.QueryString["id"] == null)
{
Response.Redirect("anotherpage.aspx");
}
Try the code provided in snipped box below in your code behind file. Make sure to make appropriate changes as per your situation.
'Define this on class/page level
Private m_intArticleId As Integer
Private m_strName As String
'Write below code in Page_Load event
If Request.QueryString("id") IsNot Nothing Then
'For Integer Values
If Integer.TryParse(Request.QueryString("id"), m_intArticleId) Then
SqlDataSource1.SelectParameters.Add("ArticleId", TypeCode.Int32, m_intArticleId)
Else
'Send some default value here such as 0
SqlDataSource1.SelectParameters.Add("ArticleId", TypeCode.Int32, 0)
'Alternatively hide the grid and display default content on page directly
'GridView1.Visible = False
'Show some default text on some Label, etc. or unhide a pre
End If
'For String Values
If Request.QueryString("id").Length > 0 Then
SqlDataSource1.SelectParameters.Add("ArticleId", TypeCode.Int32, m_intArticleId)
Else
'Send some default value here such as 0
SqlDataSource1.SelectParameters.Add("ArticleId", TypeCode.Int32, 0)
'Alternatively hide the grid and display default content on page directly
'GridView1.Visible = False
'Show some default text on some Label, etc. or unhide a pre
End If
End If
The String part in the above posted code has been wrongly posted, Use this one instead.
'For String Values
If Request.QueryString("name").Length > 0 Then
SqlDataSource1.SelectParameters.Add("ArticleId", TypeCode.String, Request.QueryString("name"))
Else
'Send some default value here
SqlDataSource1.SelectParameters.Add("ArticleId", TypeCode.Int32, "SomeDefaultName")
'Alternatively hide the grid and display default content on page directly
'GridView1.Visible = False
'Show some default text on some Label, etc. or unhide a pre
End If
Find herewith the code in C#. I mostly use this converter to get the most good inter-convertion of VB and C#: http://www.developerfusion.com/tools/convert/vb-to-csharp/
//Define this on class or page level
private int m_intArticleId;
private string m_strName;
//Write below code in Page_Load event
if (Request.QueryString("id") != null) {
//For Integer Values
if (int.TryParse(Request.QueryString("id"), m_intArticleId)) {
SqlDataSource1.SelectParameters.Add("ArticleId", TypeCode.Int32, m_intArticleId);
}
else {
//Send some default value here such as 0
SqlDataSource1.SelectParameters.Add("ArticleId", TypeCode.Int32, 0);
}
//Alternatively hide the grid and display default content on page directly
//GridView1.Visible = False
//Show some default text on some Label, etc. or unhide a pre
//For String Values
if (Request.QueryString("name").Length > 0) {
SqlDataSource1.SelectParameters.Add("C_Name", TypeCode.String, Request.QueryString("name"));
}
else {
//Send some default value here
SqlDataSource1.SelectParameters.Add("C_Name", TypeCode.Int32, "SomeDefaultName");
}
//Alternatively hide the grid and display default content on page directly
//GridView1.Visible = False
//Show some default text on some Label, etc. or unhide a pre
}
Change Line 30 of above code to:
SqlDataSource1.SelectParameters.Add("C_Name", TypeCode.String, "SomeDefaultName");
Hi Moghazali,
I'm getting errors from line 9 in your code. The first error is: "The best overloaded method match for 'int.TryParse(string, out int)' has some invalid arguments"?
Thanks,
Keith
I'm getting errors from line 9 in your code. The first error is: "The best overloaded method match for 'int.TryParse(string, out int)' has some invalid arguments"?
Thanks,
Keith
don't need to use int32 change it to
if (int.TryParse(Request.Quer
if (int.TryParse(Request.Quer
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