水晶报告错误消息 [英] crystal report error message

问题描述

我创建了CrystalReportSource并尝试了此代码

i create CrystalReportSource and tried this code

protected void Page_Load(object sender, EventArgs e)
{ 
ReportDocument crystalReport = new ReportDocument();
crystalReport.Load(Server.MapPath("CrystalReport1.rpt"));
crystalReport.SetDatabaseLogon("sa", "1@@@@9", @"server", "database");
CrystalReportViewer1.ReportSource = crystalReport;
}

它工作正常，但是当我放置过滤器参数时，它会在水晶报表页面上显示此消息..

对象引用未设置为对象的实例

it work fine , but when i put filter parameter it is showing this message on crystal report page..

object reference not set to an instance of an object

how can i solve this issue???

推荐答案

对象引用未设置为对象的实例

当您尝试使用属性或调用对象的方法为null时，会发生此错误.更多详细信息:此处 [，您的过滤器参数没有值，因此您尝试应用它们.纠正逻辑/流程.

Object reference not set to an instance of an object

This error happens when you try to use a property or call a method of an object that is null. More details: here[^]

A simple use of Visual studio DEBUGGER can tell you the object because of which it is happening. Just look at the stack trace and put a debugger on that line. Check the objects of that line and see if any one is null and you are trying to use that objects property. Handle the same.

For now, based on "when i put filter parameter it is showing this message", your filter parameters are having no values and you are trying to apply them. Correct the logic/flow.

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