编译器错误 CS1614
“name”的含义不明确,有可能表示“name”,也有可能表示“nameAttribute”;使用“@name”或“nameAttribute”。
编译器遇到了不明确的属性指定。
为方便起见,C# 编译器允许将“ExampleAttribute”指定为 [Example]
。 但是,如果名为 Example
的属性类与“ExampleAttribute”同时存在,则会引起歧义,因为编译器无法确定 [Example]
是指 Example
属性还是“ExampleAttribute”属性。 为阐释清楚,将 [@Example]
用作 Example
属性,将 [ExampleAttribute]
用作“ExampleAttribute”。
下面的示例生成 CS1614:
// CS1614.cs
using System;
// Both of the following classes are valid attributes with valid
// names (MySpecial and MySpecialAttribute). However, because the lookup
// rules for attributes involves auto-appending the 'Attribute' suffix
// to the identifier, these two attributes become ambiguous; that is,
// if you specify MySpecial, the compiler can't tell if you want
// MySpecial or MySpecialAttribute.
public class MySpecial : Attribute {
public MySpecial() {}
}
public class MySpecialAttribute : Attribute {
public MySpecialAttribute() {}
}
class MakeAWarning {
[MySpecial()] // CS1614
// Ambiguous: MySpecial or MySpecialAttribute?
public static void Main() {
}
[@MySpecial()] // This isn't ambiguous, it binds to the first attribute above.
public static void NoWarning() {
}
[MySpecialAttribute()] // This isn't ambiguous, it binds to the second attribute above.
public static void NoWarning2() {
}
[@MySpecialAttribute()] // This is also legal.
public static void NoWarning3() {
}
}