非空

• Objects based on nullable types are only boxed if the object is non - null
  基于可空类型的对象只在该对象为非空时才会装箱。
• Contains keys that are not a null reference nothing in visual basic
  是否包含非空引用（在visual basic中为nothing ）的键。
• A nonempty intersection theorem in general topological spaces and its applications
  一般拓扑空间中的一个非空交定理及其应用
• Not all the non - null entries in delegates are instances of the same delegate type
  中的所有非空项都是同一委托类型的实例。
• Encounters blank lines , they are skipped and the next non - blank line is returned
  遇到空行，则跳过空行并返回下一个非空行。
• The project is not empty
  项目非空。
• Returns non - null , there is no guarantee that the memory really is available
  返回一个非空值，也不能确保现在真的有内存可用。
• Is greater than 256 characters when the value is non - a null reference nothing
  当值为非空引用（在visual basic中为nothing ）时，
• Comparison operators to make comparisons with null and nonnull values in a table
  )比较运算符对表中的null值和非空值进行比较。
• Otherwise , may be non - null if the provider supports extended error information
  否则，如果提供程序支持扩展错误信息，则可能为非空。