Vista - Problem with setting Properties to UserControls

Hi,

I was trying to set properties to a user control I was writing, name it
'uc1'. I placed uc1 in another user control I'd wrote: 'mainUc'. In uc1 I
have set a few WebControls and some public properties (e.g., Double[]
_prices; Prices) and initialized them on Page_Load.

When the application runs (a web form) it loads 'mainUc' that contains
'uc1'. As long as no post back is being applied uc1.Prices[i] contains the
value that was set on Page_Load (not on PostBack), but if i triy to access
this property (or any other) I get nothing or exception in case of array.

Is there a way to define properties that will still be 'alive' after
postback (without using WebControls)? Am I doing something wrong by applying
win application techniques to web environment?

Thanks,
David

Hello David,

Based on your description, I guess you may write code like the following,

In the uc1.ascx.cs,
public double[] Prices;

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Prices = new double[4] { 1.1, 2.2, 3.3, 4.4 };
}
}

In the Default.aspx.cs
protected void Button1_Click(object sender, EventArgs e)
{
foreach (double d in this.mainUc1.uc11.Prices)
{
Debug.Print (d.ToString());
}
}

In this case, when the web form starts, the uc1's Page_Load function is
called. Since this is first time the page gets loaded, the Prices array's
initial codes will be executed. After that, if we click the button on the
default page, the child user control gets post back. This time, the initial
codes is not executed. Therefore later when we are trying to access the
Prices array in the button click event handle, it will throws an exception.

To keep the variable still available after the uc1 is post back, we cannot
store it in the class property. We need to store it in the ApplicationState
collection as described in this MSDN document
http://msdn.microsoft.com/en-us/libr...rol.ispostback
(VS.71).aspx.

The following code works fine in my side,

In the uc1.ascx.cs,
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
this.Application.Add("Prices",new double[4] { 1.1, 2.2,
3.3, 4.4 });
}
}

In the Default.aspx.cs
protected void Button1_Click(object sender, EventArgs e)
{
foreach (double d in
(double[])this.mainUc1.uc11.Application.Get("Prices"))
{
Debug.Print (d.ToString());
}
}

If I have misunderstood your questions, please feel free to let me know.
And I will try my best to follow up. Have a nice day!

Best regards,
Ji Zhou (v-jzho@xxxxxx, remove 'online.')
Microsoft Online Community Support

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Hi Ji,

It looks like a solution for my problem. I'll study it and let you know.

Thank you so much,
David
"""Ji Zhou [MSFT]""" <v-jzho@xxxxxx> wrote in message
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