/*internal static PropertyMeta<TEnt, TProp> By(Expression<Func<TEnt, TProp>> expGet)
* {
* var prop = ((MemberExpression) expGet.Body).Member as PropertyInfo;
* return new PropertyMeta<TEnt, TProp>(prop)
* {
* _getter = expGet.Compile()
* };
* }*/
public PropertyMeta(PropertyInfo prop, PropMetaAttribute attr)
{
Name = prop.Name;
AttrSet = attr;
Getter = TypeExtend.GetPropertyGetter <TEnt, TProp>(prop);
Setter = TypeExtend.GetPropertySetter <TEnt, TProp>(prop);
}
/// <summary>
/// 默认属性值验证
/// </summary>
public virtual string Validate(PropMetaAttribute attrSet, TProp propVal)
{
if (attrSet.IsRequired && propVal == null)
{
return($"未设置{attrSet.CnName}");
}
return(null);
}
private BasePropMeta <T> Prop(PropertyInfo prop, PropMetaAttribute propSet)
{
//用PropertyInfo反射创建Meta
var meta = Activator.CreateInstance(typeof(PropertyMeta <,>).MakeGenericType(typeof(T), prop.PropertyType), prop, propSet) as BasePropMeta <T>;
if (meta != null)
{
PropMetas.Add(prop.Name, meta);
}
return(meta);
}
public override string Validate(PropMetaAttribute attrSet, string propVal)
{
if (attrSet.IsRequired && propVal.IsNull())
{
return($"{attrSet.CnName}不能为空");
}
if (attrSet.MaxValue != 0 && propVal?.Length > attrSet.MaxValue)
{
return($"{attrSet.CnName}长度不能大于{attrSet.MaxValue}");
}
return(null);
}
public override string Validate(PropMetaAttribute attrSet, long propVal)
{
if (attrSet.IsRequired && propVal <= 0)
{
return($"{attrSet.CnName}需大于0");
}
if (attrSet.MaxValue != 0 && propVal > attrSet.MaxValue)
{
return($"{attrSet.CnName}不能大于{attrSet.MaxValue}");
}
return(null);
}