Queryable.AsQueryable<TElement> Method (IEnumerable<TElement>)
Silverlight
Converts a generic IEnumerable<T> to a generic IQueryable<T>.
Namespace: System.Linq
Assembly: System.Core (in System.Core.dll)
Type Parameters
- TElement
The type of the elements of source.
Parameters
- source
- Type: System.Collections.Generic.IEnumerable<TElement>
A sequence to convert.
Return Value
Type: System.Linq.IQueryable<TElement>An IQueryable<T> that represents the input sequence.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable<TElement>. When you use instance method syntax to call this method, omit the first parameter.| Exception | Condition |
|---|---|
| ArgumentNullException | source is null. |
If the type of source implements IQueryable<T>, AsQueryable<TElement>(IEnumerable<TElement>) returns it directly. Otherwise, it returns an IQueryable<T> that executes queries by calling the equivalent query operator methods in Enumerable instead of those in Queryable.
The following code example demonstrates how to use AsQueryable<TElement>(IEnumerable<TElement>) to convert an IEnumerable<T> to an IQueryable<T>.
List<int> grades = new List<int> { 78, 92, 100, 37, 81 }; // Convert the List to an IQueryable<int>. IQueryable<int> iqueryable = grades.AsQueryable(); // Get the Expression property of the IQueryable object. System.Linq.Expressions.Expression expressionTree = iqueryable.Expression; outputBlock.Text += "The NodeType of the expression tree is: " + expressionTree.NodeType.ToString() + "\n"; outputBlock.Text += "The Type of the expression tree is: " + expressionTree.Type.Name + "\n"; /* This code produces the following output: The NodeType of the expression tree is: Constant The Type of the expression tree is: EnumerableQuery`1 */
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.
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