FieldWBlock Function |  |
Return a set-get code block for a field, specified as a string, in a specified work area.
Namespace: XSharp.RT
Assembly: XSharp.RT (in XSharp.RT.dll) Version: 2.21
SyntaxFUNCTION FieldWBlock( cFieldName AS STRING, dwWorkArea AS USUAL ) AS Codeblock
public static Codeblock FieldWBlock( string cFieldName, Usual dwWorkArea )
Parameters
- cFieldName
- Type: String
The name of the field. - dwWorkArea
- Type: Usual
The work area number where the field resides.
Return Value
Type: CodeblockA runtime code block (implemented as an object) that, when evaluated, sets (assigns) or gets (retrieves) the value of cFieldName in the work area designated by dwWorkArea.
If cFieldName does not exist in the specified work area, FieldWBlock() returns NULL_OBJECT.
Remarks
FieldWBlock() builds a code block. When evaluated with the Evaluate() function, the code block first selects the designated dwWorkArea.
If an argument was passed, the code block then assigns the value of the argument to cFieldName.
If no argument was passed, the code block retrieves the value of cFieldName.
The original work area is then reselected before the code block returns control. Note that the specified field variable does not have to exist when the code block is created but must exist before the code block is executed.
If an argument was passed, the code block then assigns the value of the argument to cFieldName.
If no argument was passed, the code block retrieves the value of cFieldName.
The original work area is then reselected before the code block returns control. Note that the specified field variable does not have to exist when the code block is created but must exist before the code block is executed.
Examples
This example compares FieldWBlock() to a code block created using the macro operator. Note that using FieldWBlock() avoids the speed and size overhead of the macro operator:
X#
1// Set-Get block for work area 1 defined with macro operator 2cbSetGet := &("{|SetVal| If(SetVal == NIL, ; 3 1->FName, 1->FName := SetVal)}") 4// Set-Get block defined using FieldWBlock() 5// cbSetGet created here is the functional equivalent of cbSetGet above 6cbSetGet := FieldWBlock("FName", 1)
See Also