| QueryableExIfTResult Method (IQueryProvider, ExpressionFuncBoolean, IEnumerableTResult, IEnumerableTResult) |
Returns an enumerable sequence based on the evaluation result of the given condition.
Namespace: System.Linq
Assembly: System.Interactive.Providers (in System.Interactive.Providers.dll) Version: 1.2.0.0
SyntaxC#
public static IQueryable<TResult> If<TResult>( this IQueryProvider provider, Expression<Func<bool>> condition, IEnumerable<TResult> thenSource, IEnumerable<TResult> elseSource )
Parameters
- provider
- Type: System.LinqIQueryProvider
Query provider. - condition
- Type: System.Linq.ExpressionsExpressionFuncBoolean
Condition to evaluate. - thenSource
- Type: System.Collections.GenericIEnumerableTResult
Sequence to return in case the condition evaluates true. - elseSource
- Type: System.Collections.GenericIEnumerableTResult
Sequence to return in case the condition evaluates false.
Type Parameters
- TResult
- Result sequence element type.
Return Value
Type: IQueryableTResultEither of the two input sequences based on the result of evaluating the condition.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type IQueryProvider. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).See Also