泛型方法中的Where子句

Question

我有一个通用方法，需要2个泛型参数：BType和IType。有没有办法在方法签名中定义BType必须是IType的实现？！？

Edit1：这里是方法签名：

public static Expression<Func<BType, bool>> CastFunc<BType,IType>(Expression<Func<IType, bool>> customWhereClause)

Answer 1

public void Foo<BType, IType>(BType a, IType b) where BType : IType

Answer 2

public static Expression<Func<BType, bool>> CastFunc<BType,IType>(Expression<Func<IType, bool>> customWhereClause) where BType : IType

文档＆＃34;类型参数的约束＆＃34;：http://msdn.microsoft.com/en-us/library/d5x73970.aspx