标准C允许使用需要引用自身的表达式初始化对象或变量，但只适用于非静态作用域的对象。
Standard C allows for the initialization of an object or variable with an expression involving a reference to itself, but only for objects of nonstatic extent.
表示一个表达式，该表达式创建新对象并初始化该对象的一个属性。
Represents an expression that creates a new object and initializes a property of the object.
查询表达式经常使用匿名类型，而这些类型只能使用对象初始值设定项进行初始化。
Query expressions make frequent use of anonymous types, which can only be initialized with an object initializer.
查询表达式经常使用匿名类型，而这些类型只能使用对象初始值设定项进行初始化。
Query expressions make frequent use of anonymous types, which can only be initialized with an object initializer.
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