DetailsView returns null values on postback???

James

17y6.4k.NET

Hi,

I want to use a DetailsView to insert a record into an empty list.
I have a DetailsView in my page source (DefaultMode set to insert), and the datasource in set in the codebehind.

     myObject = new CustomObject();

     if (!IsPostBack)
     {
        myDetailsView.DataSource = new List() {myObject};
        myDetailsView.DataBind();
     }

...Then I run the website and type some text into one of the bound fields,
then click a button on the form...

     protected void Button_Click(object sender, EventArgs e)
     {
        string s = myObject.myProperty;
     }

But the value of the object is NULL.
Even myDetailsView.DataSource returns an empty list

what am I doing wrong??? I just want to retrieve the values types into the DetailsView
Thanks

James

5 Replies

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James17y ago
Hi,

not quite - myObject is a globally defined variable, and in the page_init I set it to a new customObject() - but only if not isPostback.

Then in the page_Load I bind the DetailsView to the datasource I created, by making a CustomObject list with myObject in as the first/only item.
I only bind it on not isPostback otherwise the viewstate binds the original list on postback and and newly inserted data is lost.

I guess I need to catch the data insert somehow, insert it into the list, and then rebind on every postback.

But I cant find how to get the data without making ItemTemplates so that each TextBox has an ID that I can access.
DetailsView.DataSource is null on postback and every property in DetailsView appears to be.
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Kirtan Patel17y ago
so you want it like object is passed to DetailView and you wat that Detail view Filled With obj Values and Also Editable right ??
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jinge17y ago
If I understand it right. You were defining the "myObject" in the contructor as a temp variable, right?

So when you want to get its value in the button click event handler, you get null value since myObject has gone out of its scope.

The right way shoulb be like the following in the button click event handler.
string s = ((myDetailsView.DataSource as List)[0]).Name;
Let me know if it works.
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James17y ago
I have created an object called User with properties like FirstName, LastName, EmailAddress, etc.

Then I have created a new instance of this with no data filled in
User myNewUser = new User();

then I add this to a list as a detailsview needs a collection
List userList = new List() {myNewUser};

The set that as the datasource and bind it.

What I want to do is fill in the fields on the dataview (like FirstName, etc)
and when the user clicks a button on the form, I want to get the values they have entered as part of a new object
so I can say myNewObject.Name and get the value they typed into the detailsview field.

However, in the ButtonClick event, I interrogate the object/detailsview datasource and they are null. So where is the data?
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Kirtan Patel17y ago
Hey Friend,

i really does not understood what you excalty want to do

but as per i understood try to give you answer

protected void Page_Load(object sender, EventArgs e)

    {

        List<string> list = new List<string>();

        list.Add("TestItem1");

        list.Add("TestItem2");

        list.Add("TestItem3");

        DetailsView1.DataSource = list;

        DataBind();

    }

it it helps you check "Do you like answer"

it if does not help you then explain a bit more in clear language :)

or just mail me your project (zip ) with more information in mail at [email protected]

i will help you out :)

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