Arcgis中使用SearchExpression注意
在使用AO，MO座二次开发中经常要用到属性查询，对于不同数据源表达式有细微差别，请参考：
Remarks
When using SearchExpression, bear in mind that the expression may be parsed and executed within MapObjects, or may be passed to the appropriate daat source for parsing and evaluation. This means you should pay special attention to the syntax according to the data source you are search against. Review the following notes for more information.