Home Library Learn Samples Downloads Support Community Forums
This topic has not yet been rated - Rate this topic

MetaModel Class

.NET Framework 4.5

Represents one or multiple databases that are used by ASP.NET Dynamic Data.

System.Object
  System.Web.DynamicData.MetaModel

Namespace:  System.Web.DynamicData
Assembly:  System.Web.DynamicData (in System.Web.DynamicData.dll)
C#
C++
F#
VB
Copy 
public class MetaModel

The MetaModel type exposes the following members.

  NameDescription
Public methodMetaModel()Instantiates a new instance of the MetaModel class.
Public methodMetaModel(Boolean)Instantiates a new instance of the MetaModel class.
Top
  NameDescription
Public propertyStatic memberDefaultGets the first instance of a data model that is created by the application.
Public propertyDynamicDataFolderVirtualPathGets or sets the virtual path of the DynamicData folder in the Web site.
Public propertyEntityTemplateFactoryGets or sets the EntityTemplateFactory object that is associated with the model.
Public propertyFieldTemplateFactoryGets or sets a custom IFieldTemplateFactory interface.
Public propertyFilterFactoryGets or sets the FilterFactory object that is associated with the model.
Public propertyTablesGets a collection of all the tables that are part of the data model.
Public propertyVisibleTablesGets a collection of the visible tables in the data model.
Top
  NameDescription
Protected methodCreateTableInstantiates a MetaTable object.
Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetActionPathReturns the action path that is associated with a specific table.
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodStatic memberGetModelReturns the data-model instance for the specified context.
Public methodGetTable(String)Returns the metadata that is associated with the specified table.
Public methodGetTable(Type)Returns the metadata that describes the specified table.
Public methodGetTable(String, Type)Returns the metadata that describes the specified table.
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodRegisterContext(DataModelProvider)Registers a data context instance by using a data-model provider
Public methodRegisterContext(Func<Object>)Registers the data context that is specified by a context factory.
Public methodRegisterContext(Type)Registers a data-context instance.
Public methodRegisterContext(DataModelProvider, ContextConfiguration)Registers a data-context instance by using the specified context configuration and by enabling a data-model provider.
Public methodRegisterContext(Func<Object>, ContextConfiguration)Registers a data-context instance by using the specified context configuration and by enabling a custom constructor.
Public methodRegisterContext(Type, ContextConfiguration)Registers a data-context instance by using the specified context configuration.
Public methodStatic memberResetRegistrationExceptionResets any previous context registration error that might have occurred.
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
Public methodTryGetTable(String, MetaTable)Attempts to get the metadata that is associated with the specified table.
Public methodTryGetTable(Type, MetaTable)Attempts to get the metadata that is associated with the specified table.
Top
ExceptionCondition
InvalidOperationException

Can be thrown by any method if there has been a data context registration error.

The MetaModel type lets you register one or multiple data contexts for a Dynamic Data Web application.

A data context is an object that represents a database connection. A data context has access to one data model which represents a database that is available through that connection. A data model is an object that represents a database's data entities as CLR types. Dynamic Data supports data models based on LINQ to SQL and on the ADO.NET Entity Framework.

In Visual Studio, you can generate data-model types by using the LINQ to SQL Classes template or the ADO.NET Entity Data Model template. These templates use the Object Relational Designer (O/R Designer) for the LINQ to SQL model, or the ADO.NET Entity Data Model Designer (Entity Designer) for the Entity Framework model.

The following example shows how to use MetaModel type to perform the following tasks in order to use automatic scaffolding in an ASP.NET Web site:

  • Get the data model for the default data context.

  • Get the data model for a specified data context.

  • Evaluate the routing path (determine the URL) for a specified table.

The example consists of a page and its code-behind file.

VB
Copy 
<%@ Page Language="VB" AutoEventWireup="false" 
CodeFile="PathModel.aspx.vb" 
Inherits="PathModel" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>Path Model</title>
</head>
<body>
    <asp:DynamicDataManager ID="DynamicDataManager1" runat="server"
        AutoLoadForeignKeys="true" />

    <h3>GetActionPath</h3>

    <form id="form1" runat="server">
        <asp:GridView ID="GridDataSource1" runat="server"
        AutoGenerateColumns="false"
        DataSourceID="LinqDataSource1"
        AllowPaging="true">
        <Columns>
        <asp:TemplateField>
          <ItemTemplate>
            <asp:HyperLink ID="HyperLink1" runat="server" 
            NavigateUrl="<%#EvaluateActionPath()%>">ListDetails</asp:HyperLink>
          </ItemTemplate>
         </asp:TemplateField>
          <asp:DynamicField DataField="FirstName" />
          <asp:DynamicField DataField="LastName" />
        </Columns>
      </asp:GridView>

        <asp:LinqDataSource ID="LinqDataSource1" runat="server" 
        TableName="Customers"
        ContextTypeName="AdventureWorksLTDataContext" >
      </asp:LinqDataSource>
    </form>
</body>

</html>
C#
VB
Copy 
<%@ Page Language="C#" AutoEventWireup="true" 
CodeFile="PathModel.aspx.cs" 
Inherits="PathModel" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Path Model</title>
</head>
<body>
    <asp:DynamicDataManager ID="DynamicDataManager1" runat="server"
        AutoLoadForeignKeys="true" />

    <h3>GetActionPath</h3>

    <form id="form1" runat="server">
        <asp:GridView ID="GridDataSource1" runat="server"
        AutoGenerateColumns="false"
        DataSourceID="LinqDataSource1"
        AllowPaging="true">
        <Columns>
        <asp:TemplateField>
          <ItemTemplate>
            <asp:HyperLink ID="HyperLink1" runat="server" 
            NavigateUrl="<%#EvaluateActionPath()%>">ListDetails</asp:HyperLink>
          </ItemTemplate>
         </asp:TemplateField>
          <asp:DynamicField DataField="FirstName" />
          <asp:DynamicField DataField="LastName" />
        </Columns>
      </asp:GridView>

        <asp:LinqDataSource ID="LinqDataSource1" runat="server" 
        TableName="Customers"
        ContextTypeName="AdventureWorksLTDataContext" >
      </asp:LinqDataSource>
    </form>
</body>

</html>
C#
Copy 
using System;
using System.Web.DynamicData;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel;

[MetadataType(typeof(ProductMetaData))]
public partial class Product
{

}


public class ProductMetaData
{



}
C#
VB
Copy 
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Web.DynamicData;

public partial class PathModel : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        DynamicDataManager1.RegisterControl(GridDataSource1);
    }

    // Get the data model.  
    public MetaModel GetModel(bool defaultModel)
    {
        MetaModel model;

        if (defaultModel)
            model = MetaModel.Default;
        else
            model =
               MetaModel.GetModel(typeof(AdventureWorksLTDataContext));
        return model;
    }

    // Get the registered action path. 
    public string EvaluateActionPath()
    {
        string tableName = LinqDataSource1.TableName;

        MetaModel model = GetModel(false);

        string actionPath =
            model.GetActionPath(tableName,
                System.Web.DynamicData.PageAction.List, GetDataItem());
        return actionPath;
    }
}

To compile the example, you need the following:

See a run-time code example of this feature: Run.

.NET Framework

Supported in: 4.5, 4, 3.5 SP1

Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
Did you find this helpful?
(1500 characters remaining)
© 2013 Microsoft. All rights reserved.