[英]Nullreference exception was unhandled
I am creating a microsoft WPF project and ran into the following hindrance: 我正在创建一个Microsoft WPF项目,遇到以下障碍:
Null reference was unhandled Object reference not set to an instance of an object 空引用未处理对象引用未设置为对象的实例
My VS 2010 points to the following line of code: 我的VS 2010指向以下代码行:
string connectionString = ConfigurationManager.ConnectionStrings["Lab06Wpf.Properties.Settings.AppConnectionString"].ConnectionString;
Not sure why this is happening, I have a similar project where I have a similar connection string and it runs itself just fine. 不知道为什么会这样,我有一个类似的项目,其中有一个类似的连接字符串,它本身运行良好。
The ConnectionStrings argument Lab06Wpf.Properties.Settings.AppConnectionString
is valid and the connection has been tested. ConnectionStrings参数Lab06Wpf.Properties.Settings.AppConnectionString
有效,并且连接已经过测试。
Any leads anyone? 有带头人吗?
ConfigurationManager.ConnectionStrings["Lab06Wpf.Properties.Settings.AppConnectionString"]
That is returning null and your are calling ConnectionString
on it. 那将返回null,并且您正在对其调用ConnectionString
。 You need to find out why it is returning null. 您需要找出为什么它返回空值。 Use your debugger to see what ConnectionStrings
contains and why your call is failing. 使用调试器查看ConnectionStrings
包含的内容以及调用失败的原因。
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