F# programming guide

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The type name is generated by the compiler and is not available at the source code level. The type of each property is inferred by the compiler. You create anonymous types by using the new operator together with an object initializer. For more information about object initializers, see Object and Collection Initializers. The following example shows an anonymous type that is initialized with two properties named Amount and Message. Rest the mouse pointer over v.

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Anonymous types contain one or more public read-only properties. No other kinds of class members, such as methods or events, are valid. The expression that is used to initialize a property cannot be null, an anonymous function, or a pointer type. The most common scenario is to initialize an anonymous type with properties from another type. In the following example, assume that a class exists that is named Product. Class Product includes Color and Price properties, together with other properties that you are not interested in. Variable products is a collection of Product objects.

The anonymous type declaration starts with the new keyword. If you do not specify member names in the anonymous type, the compiler gives the anonymous type members the same name as the property being used to initialize them. You must provide a name for a property that is being initialized with an expression, as shown in the previous example. In the following example, the names of the properties of the anonymous type are Color and Price. You can create an array of anonymously typed elements by combining an implicitly typed local variable and an implicitly typed array, as shown in the following example. If two or more anonymous object initializers in an assembly specify a sequence of properties that are in the same order and that have the same names and types, the compiler treats the objects as instances of the same type.