X# Runtime and VO SDK Reference
X# Runtime and SDK Reference
XSharp Namespace
CoreDb Class
CoreDb Methods
CoreDb._ErrInfoPtr Method
CoreDb.Alias Method
CoreDb.Append Method
CoreDb.BlobInfo Method
CoreDb.Bof Method
CoreDb.BuffRefresh Method
CoreDb.ClearFilter Method
CoreDb.ClearLocate Method
CoreDb.ClearRelation Method
CoreDb.ClearScope Method
CoreDb.CloseAll Method
CoreDb.CloseArea Method
CoreDb.Commit Method
CoreDb.CommitAll Method
CoreDb.Continue Method
CoreDb.Create Method
CoreDb.Dbf Method
CoreDb.Delete Method
CoreDb.Deleted Method
CoreDb.Eof Method
CoreDb.Eval Method
CoreDb.FCount Method
CoreDb.FieldGet Method
CoreDb.FieldGetBytes Method
CoreDb.FieldInfo Method
CoreDb.FieldName Method
CoreDb.FieldPos Method
CoreDb.FieldPut Method
CoreDb.FieldPutBytes Method
CoreDb.FileGet Method
CoreDb.FilePut Method
CoreDb.Filter Method
CoreDb.Flock Method
CoreDb.Found Method
CoreDb.GetScope Method
CoreDb.GetSelect Method
CoreDb.GoBottom Method
CoreDb.Goto Method
CoreDb.GoTop Method
CoreDb.Header Method
CoreDb.Info Method
CoreDb.JoinAppend Method
CoreDb.LastRec Method
CoreDb.Locate Method
CoreDb.MemoExt Method
CoreDb.OrdBagExt Method
CoreDb.OrdCondSet Method
CoreDb.OrdCreate Method
CoreDb.OrdDestroy Method
CoreDb.OrderInfo Method
CoreDb.OrdListAdd Method
CoreDb.OrdListClear Method
CoreDb.OrdListRebuild Method
CoreDb.OrdSetFocus Method
CoreDb.Pack Method
CoreDb.RddCount Method
CoreDb.RddInfo Method
CoreDb.RddList Method
CoreDb.RddName Method
CoreDb.RddSetDefault Method
CoreDb.Recall Method
CoreDb.Recno Method
CoreDb.RecordGet Method
CoreDb.RecordInfo Method
CoreDb.RecordPut Method
CoreDb.RecSize Method
CoreDb.Refresh Method
CoreDb.Relation Method
CoreDb.RLock Method
CoreDb.RSelect Method
CoreDb.Seek Method
CoreDb.Select Method
CoreDb.SetFilter Method
CoreDb.SetFound Method
CoreDb.SetLocate Method
CoreDb.SetRelation Method
CoreDb.SetScope Method
CoreDb.SetSelect Method
CoreDb.Skip Method
CoreDb.SkipScope Method
CoreDb.Sort Method
CoreDb.SymSelect Method
CoreDb.Trans Method
CoreDb.TransRec Method
CoreDb.Unlock Method
CoreDb.UnlockAll Method
CoreDb.UseArea Method
CoreDb.Zap Method
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CoreDb.Eval Method

X#
Evaluate a code block for each record that matches a specified scope and/or condition.

Namespace:  XSharp
Assembly:  XSharp.Core (in XSharp.Core.dll) Version: 2.21
Syntax
Copy
 STATIC METHOD Eval(
	uBlock AS ICodeblock,
	uCobFor AS ICodeblock,
	uCobWhile AS ICodeblock,
	uNext AS Object,
	nRecno AS Object,
	lRest AS LOGIC
) AS LOGIC
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Parameters

uBlock
Type: ICodeblock
The code block to execute for each record that matches the scope and conditions.
uCobFor
Type: ICodeblock
A code block that defines a condition that each record within the scope must meet in order to be processed.
uCobWhile
Type: ICodeblock
A code block that defines another condition that each record must meet in order to be processed. As soon as a record is encountered that causes the condition to fail, the operation terminates. If no scope is specified, cbWhileCondition changes the default scope to lRest.
uNext
Type: Object
The number of records to process, starting at the current record.
nRecno
Type: Object
The number of the record to process.
lRest
Type: Logic
TRUE processes only records from the current record to end-of-file. FALSE processes all records.

Return Value

Type: Logic
TRUE if successful; otherwise, FALSE.
Remarks
By default, Eval() operates on the currently selected work area. It will operate on an unselected work area if you specify it as part of an aliased expression. On each iteration, Eval() evaluates the specified code block. All records within the scope or matching the condition are processed until end-of-file is reached. Eval() can be used as a primitive for the construction of commands that process database files. In fact, many of the database processing commands are created using Eval().
See Also