ASP.NET Web Forms 4.5 model binding where the model contains a collection

ASP.NET Web Forms 4.5 model binding where the model contains a collection

ASP.NET Web Forms 4.5 supports model binding, which allows you to automatically populate an object with data from a request. When the model contains a collection, you can use the Bind attribute to specify the prefix for the collection items in the request.

Here's an example of how to use the Bind attribute to bind a collection property on a model:

public class MyModel
{
    public int Id { get; set; }
    public string Name { get; set; }
    public List<ItemModel> Items { get; set; }
}

public class ItemModel
{
    public int Id { get; set; }
    public string Name { get; set; }
}

public partial class Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (IsPostBack)
        {
            var model = new MyModel();
            TryUpdateModel(model, new FormValueProvider(ModelBindingExecutionContext));
            // ...
        }
    }
}

In this example, we define a MyModel class that contains a list of ItemModel objects. In the Page_Load method, we use the TryUpdateModel method to populate a new instance of MyModel with data from the request. We pass in a FormValueProvider that specifies the source of the data for the model binding.

To bind the collection of ItemModel objects, we use the Bind attribute on the Items property. The prefix item specifies that the collection items should be prefixed with item in the request, for example:

<input type="text" name="item[0].Id" value="1" />
<input type="text" name="item[0].Name" value="Item 1" />
<input type="text" name="item[1].Id" value="2" />
<input type="text" name="item[1].Name" value="Item 2" />

When the TryUpdateModel method is called, it will automatically populate the Items collection with two ItemModel objects based on the data in the request.

Note that the Bind attribute can also be used to specify other options for model binding, such as ignoring certain properties or including only certain properties.

Examples

  1. Model Binding with Simple Collection in ASP.NET Web Forms 4.5:

    • Description: How to perform model binding in ASP.NET Web Forms 4.5 with a simple collection property in the model.
    • Code:
      public class MyModel
{
    public List<string> Items { get; set; }
}

  2. Binding a GridView to a Collection Property in ASP.NET Web Forms:

    • Description: Binding a GridView control to a collection property in the model for displaying and editing data.
    • Code:
      <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="true" ItemType="MyModel" SelectMethod="GetData" />

  3. Handling Collection Model Binding in ASP.NET Web Forms 4.5:

    • Description: How to handle model binding when the model contains a complex collection property.
    • Code:
      public class MyModel
{
    public List<MyItem> Items { get; set; }
}

public class MyItem
{
    public string Name { get; set; }
    // Other properties
}

  4. Model Binding with Nested Collection in ASP.NET Web Forms:

    • Description: Implementing model binding with a nested collection property in ASP.NET Web Forms 4.5.
    • Code:
      public class MyModel
{
    public List<Category> Categories { get; set; }
}

public class Category
{
    public string Name { get; set; }
    public List<Product> Products { get; set; }
}

public class Product
{
    public string Name { get; set; }
    // Other properties
}

  5. Using Data Controls with Collection Model Binding:

    • Description: Utilizing data controls like Repeater or ListView with collection model binding in ASP.NET Web Forms.
    • Code:
      <asp:Repeater ID="Repeater1" runat="server" ItemType="MyItem" SelectMethod="GetItems">
    <ItemTemplate>
        <%# Item.Name %>
    </ItemTemplate>
</asp:Repeater>

  6. Handling Postback with Collection Model Binding:

    • Description: Managing postback scenarios when working with model binding and collections in ASP.NET Web Forms.
    • Code:
      protected void Page_Load(object sender, EventArgs e)
{
    if (IsPostBack)
    {
        // Access and update collection data
        // ...
    }
}

  7. Editing a Collection in ASP.NET Web Forms Model Binding:

    • Description: Implementing an edit scenario for a collection property in ASP.NET Web Forms model binding.
    • Code:
      // Handle editing and updating collection data
protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
    // Update collection data
    // ...
}

  8. Model Binding with Repeater Control and Collection Property:

    • Description: Using the Repeater control for model binding with a collection property in ASP.NET Web Forms.
    • Code:
      <asp:Repeater ID="Repeater1" runat="server" ItemType="MyItem" SelectMethod="GetItems">
    <ItemTemplate>
        <%# Item.Name %>
    </ItemTemplate>
</asp:Repeater>

  9. Model Binding with DropDownList and Collection Property:

    • Description: Binding a DropDownList control to a collection property in the model for selection scenarios.
    • Code:
      <asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="ObjectDataSource1" DataTextField="Name" DataValueField="Id" />

  10. Model Binding with Custom Collection Converter:

    • Description: Implementing a custom collection converter for handling specific data types during model binding.
    • Code:
      public class MyModel
{
    [TypeConverter(typeof(MyItemConverter))]
    public List<MyItem> Items { get; set; }
}

public class MyItemConverter : TypeConverter
{
    // Implement custom type conversion logic
    // ...
}

More Tags

in-app-billing url facebook-like uisearchbar filter embedded-documents timezone-offset maven-2 ef-database-first hibernate-criteria

More C# Questions

More Chemical reactions Calculators

More Chemistry Calculators

More Trees & Forestry Calculators

More Pregnancy Calculators