VB.NET Error Object reference not set to an instance of an object
2007-11-19 22:06
751 查看
出现这种错误有两种情况
1 没有使用new关键字来创建新的对象。
如Dim myCar As New Car
2 对对象或者结构体变量赋初值或试图改变对象的某些属性但是没有成功,即通过一个调用函数没有得到返回值。
如
Dim myCar As Car
myCar = myUser.GetCar(1)
以下是我的错误
在vb.net中调用windows的api函数,声明CreateEvent函数参数时声明错误(即与windows的变量长度不一致)执行如下语句一直出现上述错误。
ov.hEvent = CreateEvent(0, True, False, "can_send")
当声明正确后就可以消除异常。
1 没有使用new关键字来创建新的对象。
如Dim myCar As New Car
2 对对象或者结构体变量赋初值或试图改变对象的某些属性但是没有成功,即通过一个调用函数没有得到返回值。
如
Dim myCar As Car
myCar = myUser.GetCar(1)
以下是我的错误
在vb.net中调用windows的api函数,声明CreateEvent函数参数时声明错误(即与windows的变量长度不一致)执行如下语句一直出现上述错误。
ov.hEvent = CreateEvent(0, True, False, "can_send")
当声明正确后就可以消除异常。
相关文章推荐
- NET:Error Creating Control -"Object Reference Not Set To An Instance Of Object"
- Error with Stsadm Command-Object reference not set to an instance of an object
- Visual Studio 2015打开ASP.NET MVC的View提示"Object reference not set to an instance of an object"错误的解决方案
- 20100507 学习记录: Server Error in '/' Application. Object reference not set to an instance of an object
- Submit Reporting Table Error : Object reference not set to an instance of an object.
- ASP.NET MVC Html.TextBox 报 Object reference not set to an instance of an object 的解决方案
- VS2010 出现错误提示“Error Creating Control - Object reference not set to an instance of an objec” 的解决方法
- InputField--Object reference not set to an instance of an object
- server2008 IIS7.5 Object reference not set to an instance of an object. (未将对象引用到实例)
- 关于Unity3D的错误:NullReferenceException: Object reference not set to an instance of an object 的解答
- WebAdaptor Object reference not set to an instance of an object.
- 我遇到的Object reference not set to an instance of an object.错误的解决办法
- SQLServer2005打开表时出现“Object reference not set to an instance of an object. (SQLEditors)”错误的解决办法
- silverlight beta2.0安装成功后新建silverlight项目出现object reference not set to an instance of an object的解决办法
- silverlight项目出现object reference not set to an instance of an object的解决办法
- Object reference not set to an instance of an object.请教, 这是涉及那方面的错误啊?谢谢!
- 奇怪的 Object reference not set to an instance of an object
- NullReferenceException: Object reference not set to an instance of an object
- Object reference not set to an instance of an object.
- NullReferenceException: Object reference not set to an instance of an object