ObjectResult<T>.GetEnumerator Method

Reference

Definition

Namespace:: System.Data.Objects

Assembly:: System.Data.Entity.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Returns an enumerator that iterates through the query results.

public:
 virtual System::Collections::Generic::IEnumerator<T> ^ GetEnumerator();

public System.Collections.Generic.IEnumerator<T> GetEnumerator ();

abstract member GetEnumerator : unit -> System.Collections.Generic.IEnumerator<'T>
override this.GetEnumerator : unit -> System.Collections.Generic.IEnumerator<'T>

Public Function GetEnumerator () As IEnumerator(Of T)

Returns

IEnumerator<T>

An enumerator that iterates through the query results.

Implements

GetEnumerator()

Examples

This example returns an ObjectResult<T> from the Execute method. Then it gets an enumerator and iterates through the query results. At the end, it releases the enumerator and the ObjectResult<T> object.

using (AdventureWorksEntities context =
    new AdventureWorksEntities())
{
    ObjectSet<Product> query = context.Products;
    ObjectResult<Product> queryResults = null;

    System.Collections.IEnumerator enumerator = null;
    try
    {
        queryResults = query.Execute(MergeOption.AppendOnly);

        // Get the enumerator.
        enumerator = ((System.Collections.IEnumerable)queryResults).GetEnumerator();

        // Iterate through the query results.
        while (enumerator.MoveNext())
        {
            Product product = (Product)enumerator.Current;
            Console.WriteLine("{0}", product.Name);
        }
        // Dispose the enumerator
        ((IDisposable)enumerator).Dispose();
    }
    finally
    {
        // Dispose the query results and the enumerator.
        if (queryResults != null)
        {
            queryResults.Dispose();
        }
        if (enumerator != null)
        {
            ((IDisposable)enumerator).Dispose();
        }
    }
}

Remarks

The enumerator must be disposed when no longer needed. Using the foreach statement (For Each in Visual Basic) ensures that the enumerator is correctly disposed when iteration over the results is complete.

Applies to

Поділитися через