編譯器錯誤 CS1529Compiler Error CS1529

using 子句必須位於所有其他命名空間中所定義的元素之前 (外部別名宣告除外)A using clause must precede all other elements defined in the namespace except extern alias declarations

using 子句必須在命名空間中第一個出現。A using clause must appear first in a namespace.

範例Example

下列範例會產生 CS1529:The following sample generates CS1529:

// CS1529.cs  
namespace X  
{  
    namespace Subspace  
    {  
        using Microsoft;  
  
        class SomeClass  
        {  
        };  
  
        using Microsoft;      // CS1529, place before class definition  
    }  
  
    using System.Reflection;  // CS1529, place before namespace 'Subspace'  
}  
  
using System;                 // CS1529, place at the beginning of the file