ExpressionEvaluator.LoadExpr Method (PIA)
Use this method to pre-compile an expression, and if successful, load the expression into the expression cache.
Definition
[Visual Basic .NET]
Imports Microsoft.CommerceServer.Interop.Targeting
…
Public Sub LoadExpr(nExprID As Integer)
[C#]
using Microsoft.CommerceServer.Interop.Targeting;
…
public void LoadExpr(intnExprID);
Parameters
[Visual Basic .NET]
- nExprID
A positive Integer that contains the identifier of the expression to load into the expression cache.
[C#]
- nExprID
A positive int that contains the identifier of the expression to load into the expression cache.
Exceptions
This method may throw one of many mapped exceptions or an exception of type COMException. See Standard COM Errors for additional details.
[Visual Basic .NET]
The following table shows the custom COM errors that a COMException can wrap.
| Value | Description |
|---|---|
| &H81100018 | Argument data type information missing from expression, or unrecognized argument data type encountered in expression |
| &H81100022 | Invalid expression argument value, or impossible conversion |
| &H81100016 | Invalid clause encountered |
| &H8110001F | Invalid connection |
| &H8110000A | Invalid expression ID specified |
| &H81100017 | Operator missing, unrecognized operator encountered, or type mismatch |
| &H81100015 | Term type missing, or unrecognized term type encountered |
| &H81100014 | Unrecognized XML element encountered |
| &H8110000D | No connection string specified |
| &H81100012 | Could not find the specified expression ID, nExprID, in the expression store |
| &H81100013 | XML DOM object parsing error |
[C#]
The following table shows the custom COM errors that COMException can wrap.
| Value | Description |
|---|---|
| 0x81100018 | Argument data type information missing from expression, or unrecognized argument data type encountered in expression |
| 0x81100022 | Invalid expression argument value, or impossible conversion |
| 0x81100016 | Invalid clause encountered |
| 0x8110001F | Invalid connection |
| 0x8110000A | Invalid expression ID specified |
| 0x81100017 | Operator missing, unrecognized operator encountered, or type mismatch |
| 0x81100015 | Term type missing, or unrecognized term type encountered |
| 0x81100014 | Unrecognized XML element encountered |
| 0x8110000D | No connection string specified |
| 0x81100012 | Could not find the specified expression ID, nExprID, in the expression store |
| 0x81100013 | XML DOM object parsing error |
Remarks
If the specified expression is already loaded in the expression cache at the time of the call, it will be reloaded.
The LoadExpr method increments the read-only ExprCount property by one (1) when it loads an expression into the expression cache.
With the exception of XML fragments, only expressions that exist in the expression cache may be evaluated. The Eval method loads an expression from the expression store that is not preloaded into the expression cache.
Use the LoadAll method to load all expressions into the expression cache. Use the FlushExpr method to remove an expression from the expression cache.
The Connect method must be called before using the LoadExpr method.
Requirements
Namespace: Microsoft.CommerceServer.Interop.Targeting
Platforms: Windows 2000, Windows Server 2003
Assembly: exprarchlib (in exprarchlib.dll)
See Also
Copyright © 2005 Microsoft Corporation.
All rights reserved.