FederationConditionType Enum

Specifies the relation’s condition.

Namespace: DevExpress.DataAccess.DataFederation

Assembly: DevExpress.DataAccess.v19.2.dll

Declaration

C#

public enum FederationConditionType

VB.NET

Public Enum FederationConditionType

Members

Name	Description
Equal	Specifies the “equal” relational operator.
NotEqual	Specifies the “not equal” relational operator.
Greater	Specifies the “greater than” relational operator.
GreaterOrEqual	Specifies the “greater than or equal to” relational operator.
Less	Specifies the “less than” relational operator.
LessOrEqual	Specifies the “less than or equal to” relational operator.

Related API Members

The following properties accept/return FederationConditionType values:

• FederationRelationColumnInfo.ConditionOperator

Remarks

The FederationConditionType enumeration member is assigned to the FederationRelationColumnInfo.ConditionOperator property.

Example

To create a master-detail relationship between two queries, add an instance of the FederationMasterDetailInfo object to the Relations collection:

Note

The complete sample project How to Create a Federated Data Source at Runtime is available in the DevExpress Examples repository.

C#

using DevExpress.DataAccess.DataFederation;
// ...
  federation.Relations.Add(new FederationMasterDetailInfo() {
      MasterQueryName = "Orders",
      DetailQueryName = "OrderDetail",
      KeyColumns = {
          new FederationRelationColumnInfo(){
              ParentKeyColumn="OrderID",
              NestedKeyColumn ="OrderID",
              ConditionOperator= FederationConditionType.Equal
              }
          }
  }

VB.NET

Imports DevExpress.DataAccess.DataFederation
' ... 
  federation.Relations.Add(
      New FederationMasterDetailInfo("Orders",
                                      "OrderDetail", 
                                      New FederationRelationColumnInfo() With
                                      {.ParentKeyColumn = "OrderID",
                                      .NestedKeyColumn = "OrderID",
                                      .ConditionOperator = FederationConditionType.Equal}))