XPMemberInfo.MappingFieldSize Property

Gets the maximum number of characters that can be stored in a field which the member is mapped to.

Namespace: DevExpress.Xpo.Metadata

Assembly: DevExpress.Xpo.v24.2.dll

Declaration

C#

public int MappingFieldSize { get; }

VB.NET

Public ReadOnly Property MappingFieldSize As Integer

Property Value

Type	Description
Int32	An integer value which specifies the maximum number of characters that can be stored. 0 if the type in which the member’s value is saved to a data store isn’t a string.

Remarks

To specify the size of the mapping field, the SizeAttribute must be applied to a property or a field. Otherwise, if this attribute isn’t applied, the default size is specified which equals to 100.

Example

The following example applies the SizeAttribute to the FullName and Background properties. The maximum number of characters that can be stored in a database column which the FullName property is mapped to is 128. As for the Background property the unlimited size of the column it is mapped to is specified.

C#

using DevExpress.Xpo;

class Customer : XPObject {
    private string fullName;
    private string background;

    [Size(128)]
    public string FullName {
        get { return fullName; }
        set { SetPropertyValue<string>(nameof(FullName), ref fullName, value); }
    }

    [Size(SizeAttribute.Unlimited)]
    public string Background {
        get { return background; }
        set { SetPropertyValue<string>(nameof(Background), ref background, value); }
    }
}

VB.NET

Imports DevExpress.Xpo

Class Customer
   Inherits XPObject
   Private _FullName As String
   Private _Background As String

   <Size(128)> _
   Public Property FullName() As String
      Get
         Return _FullName
      End Get
      Set(ByVal Value As String)
         SetPropertyValue(Of String)(NameOf(FullName), _FullName, Value)
      End Set
   End Property

   <Size(SizeAttribute.Unlimited)> _
   Public Property Background() As String
      Get
         Return _Background
      End Get
      Set(ByVal Value As String)
         SetPropertyValue(Of String)(NameOf(Background), _Background, Value)
      End Set
   End Property
End Class