屬性控制類2

代碼

[AttributeUsage(AttributeTargets.Property, Inherited = false)]
    [ComVisible(true)]
public class PropertyKeyAttribute : Attribute
    {
public PropertyKeyAttribute(int Length)
        {
this.Length = Length;
this.NoneBuild = true;
        }
public PropertyKeyAttribute()
        {
this.NoneBuild = true;
        }

public int Length { get; set; }
public System.Data.SqlDbType SqlDbType { get; set; }
public string Name { get; set; }
public int Index { get; set; }
public bool NoneBuild { get; set; }



public static int GetLength<T>(string name)
        {
            PropertyKeyAttribute attr = GetPropertyKeyAttribute<T>(name);
if (attr != null)
return attr.Length;
return 20;
        }
public static System.Data.SqlDbType GetSqlDbType<T>(string name)
        {
            PropertyKeyAttribute attr = GetPropertyKeyAttribute<T>(name);
if (attr != null)
return attr.SqlDbType;
return System.Data.SqlDbType.VarChar;
        }
public static bool GetNoneBuild<T>(string name)
        {
            PropertyKeyAttribute attr = GetPropertyKeyAttribute<T>(name);
if (attr != null)
return attr.NoneBuild;
return false;
        }

public static int GetLength(object model, string name)
        {
            PropertyKeyAttribute attr = GetPropertyKeyAttribute(model, name);
if (attr != null)
return attr.Length;
return 20;
        }
public static System.Data.SqlDbType GetSqlDbType(object model, string name)
        {
            PropertyKeyAttribute attr = GetPropertyKeyAttribute(model, name);
if (attr != null)
return attr.SqlDbType;
return System.Data.SqlDbType.VarChar;
        }
public static bool GetNoneBuild(object model, string name)
        {
            PropertyKeyAttribute attr = GetPropertyKeyAttribute(model, name);
if (attr != null)
return attr.NoneBuild;
return false;
        }

#region PropertyKeyAttribute
private static PropertyKeyAttribute GetPropertyKeyAttribute<T>(string name)
        {
            T model = (T)Activator.CreateInstance(typeof(T));
            Type type = typeof(PropertyKeyAttribute);

            PropertyInfo pi = model.GetType().GetProperty(name);
object[] attributes = pi.GetCustomAttributes(false);
foreach (object o in attributes)
            {
if (o is PropertyKeyAttribute)
                {
//把得到的屬性強制轉換成PersonAttribute
                    PropertyKeyAttribute pa = (PropertyKeyAttribute)o;
return pa;
                }
            }
return null;
        }
private static PropertyKeyAttribute GetPropertyKeyAttribute(object model, string name)
        {
try
            {
                Type type = typeof(PropertyKeyAttribute);
                PropertyInfo pi = model.GetType().GetProperty(name);
object[] attributes = pi.GetCustomAttributes(false);
foreach (object o in attributes)
                {
if (o is PropertyKeyAttribute)
                    {
//把得到的屬性強制轉換成PersonAttribute
                        PropertyKeyAttribute pa = (PropertyKeyAttribute)o;
return pa;
                    }
                }
            }
catch
            {

            }
return null;
        }
#endregion


    }