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报表表达式中，还可以使用一些特殊的对象或函数，如下表：
对象或函数 | 说明 |
|---|---|
Nothing | 空指针对象，常用于判断表达式。例如：{IIF(x is Nothing, 1+2, 3+4)} |
System.DbNull.Value | 数据字段空值（NULL），常用于判断表达式。 |
UserContext.GetValue | 取用户上下文信息，专用于使用定制安全提供器实现单点登录的场合。 例如：{UserContext.GetValue("DepId")} 返回当前用户所属部门的代码。 其中DepId必须在定制安全提供程序中定义。详见用户/组织上下文。 |
# | 获取取报表内其他元素。例如：{#文本框5} 返回文本框5的内容。 |
Split | 将字符串转换为数组。 |