ListInitExpression Class
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Represents a constructor call that has a collection initializer.
Assembly: System.Core (in System.Core.dll)
The ListInitExpression type exposes the following members.
| Name | Description | |
|---|---|---|
![]() | CanReduce | Gets a value that indicates whether the expression tree node can be reduced. (Overrides Expression.CanReduce.) |
![]() | Initializers | Gets the element initializers that are used to initialize a collection. |
![]() | NewExpression | Gets the expression that contains a call to the constructor of a collection type. |
![]() | NodeType | Returns the node type of this Expression. (Overrides Expression.NodeType.) |
![]() | Type | Gets the static type of the expression that this Expression represents. (Overrides Expression.Type.) |
| Name | Description | |
|---|---|---|
![]() | Accept | Dispatches to the specific visit method for this node type. For example, MethodCallExpression calls the VisitMethodCall. (Inherited from Expression.) |
![]() | Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
![]() | Finalize | Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.) |
![]() | GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
![]() | GetType | Gets the Type of the current instance. (Inherited from Object.) |
![]() | MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() | Reduce | Reduces the binary expression node to a simpler expression. (Overrides Expression.Reduce().) |
![]() | ReduceAndCheck | Reduces this node to a simpler expression. If CanReduce returns true, this should return a valid expression. This method can return another node which itself must be reduced. (Inherited from Expression.) |
![]() | ReduceExtensions | Reduces the expression to a known node type (that is not an Extension node) or just returns the expression if it is already a known type. (Inherited from Expression.) |
![]() | ToString | Returns a textual representation of the Expression. (Inherited from Expression.) |
![]() | Update | Creates a new expression that is like this one, but using the supplied children. If all of the children are the same, it will return this expression. |
![]() | VisitChildren | Reduces the node and then calls the visitor delegate on the reduced expression. The method throws an exception if the node is not reducible. (Inherited from Expression.) |
The following example creates a ListInitExpression that represents the initialization of a new dictionary instance that has two key-value pairs.
string tree1 = "maple"; string tree2 = "oak"; System.Reflection.MethodInfo addMethod = typeof(Dictionary<int, string>).GetMethod("Add"); // Create two ElementInit objects that represent the // two key-value pairs to add to the Dictionary. System.Linq.Expressions.ElementInit elementInit1 = System.Linq.Expressions.Expression.ElementInit( addMethod, System.Linq.Expressions.Expression.Constant(tree1.Length), System.Linq.Expressions.Expression.Constant(tree1)); System.Linq.Expressions.ElementInit elementInit2 = System.Linq.Expressions.Expression.ElementInit( addMethod, System.Linq.Expressions.Expression.Constant(tree2.Length), System.Linq.Expressions.Expression.Constant(tree2)); // Create a NewExpression that represents constructing // a new instance of Dictionary<int, string>. System.Linq.Expressions.NewExpression newDictionaryExpression = System.Linq.Expressions.Expression.New(typeof(Dictionary<int, string>)); // Create a ListInitExpression that represents initializing // a new Dictionary<> instance with two key-value pairs. System.Linq.Expressions.ListInitExpression listInitExpression = System.Linq.Expressions.Expression.ListInit( newDictionaryExpression, elementInit1, elementInit2); outputBlock.Text += listInitExpression.ToString() + "\n"; // This code produces the following output: // // new Dictionary`2() {Void Add(Int32, System.String)(5,"maple"), // Void Add(Int32, System.String)(3,"oak")}
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