相关疑难解决方法(0)

通过lambda表达式传入时,是否有更好的方法来获取属性名称？这是我现在拥有的.

例如.

GetSortingInfo<User>(u => u.UserId);

只有当属性是字符串时,它才能将其作为元素表达式进行处理.因为不是所有属性都是字符串我必须使用对象,但它会返回一个单一表达式.

public static RouteValueDictionary GetInfo<T>(this HtmlHelper html, 
    Expression<Func<T, object>> action) where T : class
{
    var expression = GetMemberInfo(action);
    string name = expression.Member.Name;

    return GetInfo(html, name);
}

private static MemberExpression GetMemberInfo(Expression method)
{
    LambdaExpression lambda = method as LambdaExpression;
    if (lambda == null)
        throw new ArgumentNullException("method");

    MemberExpression memberExpr = null;

    if (lambda.Body.NodeType == ExpressionType.Convert)
    {
        memberExpr = 
            ((UnaryExpression)lambda.Body).Operand as MemberExpression;
    }
    else if (lambda.Body.NodeType == ExpressionType.MemberAccess)
    {
        memberExpr = lambda.Body as MemberExpression;
    }

    if (memberExpr …

我正在尝试使用Entity Framework MetadataWorkspace来计算导航属性的ID外键.我的模型看起来像这样:

public class Person
{
    [Key]
    public int PersonId { get; set; }

    public int AddressId { get; set; }
    public virtual Address Address { get; set; }
}

public class Address
{
    public Address()
    {
        People = new HashSet<Person>();
    }

    [Key]
    public int AddressId { get; set; }

    public virtual ICollection<Person> People { get; set; }
}

class PersonDbContext : DbContext
{
    public DbSet<Person> People { get; set; }
    public DbSet<Address> Addresses { get; set; } …