X# Runtime and VO SDK Reference
X# Runtime and SDK Reference
XSharp.RDD Namespace
Workarea Class
Workarea Methods
Workarea._getMemoBlockNumber Method
Workarea.AddField Method
Workarea.Append Method
Workarea.AppendLock Method
Workarea.BlobInfo Method
Workarea.ChildEnd Method
Workarea.ChildStart Method
Workarea.ChildSync Method
Workarea.ClearFilter Method
Workarea.ClearRel Method
Workarea.ClearScope Method
Workarea.Close Method
Workarea.CloseMemFile Method
Workarea.Compile Method
Workarea.Continue Method
Workarea.Create Method
Workarea.CreateFields Method
Workarea.CreateMemFile Method
Workarea.DbEval Method
Workarea.Delete Method
Workarea.Dispose Method
Workarea.EvalBlock Method
Workarea.EvalFilter Method
Workarea.FieldIndex Method
Workarea.FieldInfo Method
Workarea.FieldName Method
Workarea.Flush Method
Workarea.ForceRel Method
Workarea.GetField Method
Workarea.GetRec Method
Workarea.GetScope Method
Workarea.GetValue Method
Workarea.GetValueFile Method
Workarea.GetValueLength Method
Workarea.GoBottom Method
Workarea.GoCold Method
Workarea.GoHot Method
Workarea.GoTo Method
Workarea.GoToId Method
Workarea.GoTop Method
Workarea.HeaderLock Method
Workarea.Info Method
Workarea.Lock Method
Workarea.Open Method
Workarea.OpenMemFile Method
Workarea.OrderCondition Method
Workarea.OrderCreate Method
Workarea.OrderDestroy Method
Workarea.OrderInfo Method
Workarea.OrderListAdd Method
Workarea.OrderListDelete Method
Workarea.OrderListFocus Method
Workarea.OrderListRebuild Method
Workarea.Pack Method
Workarea.PutRec Method
Workarea.PutValue Method
Workarea.PutValueFile Method
Workarea.Recall Method
Workarea.RecInfo Method
Workarea.Refresh Method
Workarea.RelArea Method
Workarea.RelEval Method
Workarea.RelText Method
Workarea.Seek Method
Workarea.SetFieldExtent Method
Workarea.SetFilter Method
Workarea.SetRel Method
Workarea.SetScope Method
Workarea.Skip Method
Workarea.SkipFilter Method
Workarea.SkipRaw Method
Workarea.SkipScope Method
Workarea.Sort Method
Workarea.SyncChildren Method
Workarea.Trans Method
Workarea.TransRec Method
Workarea.UnLock Method
Workarea.Zap Method
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Workarea.HeaderLock Method

X#
Lock or unlock the header of a database file.

Namespace:  XSharp.RDD
Assembly:  XSharp.Core (in XSharp.Core.dll) Version: 2.21
Syntax
Copy
 VIRTUAL METHOD HeaderLock(
	uiMode AS DbLockMode
) AS LOGIC
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Parameters

uiMode
Type: DbLockMode
An enum value specifying the kind of lock to acquire.

Return Value

Type: Logic
TRUE when the operation succeeded or FALSE when the operation failed.
Some RDD operations do not really return FALSE but throw an exception to indicate failure.
These exceptions are caught in the higher level code and registered in the LastRddError property in the runtime state..

Implements

HeaderLock(DbLockMode)
See Also