[英]ArgumentNullException C# WebMethods
So i am trying to force the user to put values in the WebService ... But if the user sends one or more null parameters, this WebService just sends back an error. 因此,我试图强制用户将值放入WebService中……但是,如果用户发送一个或多个null参数,则此WebService只会发回一个错误。
The point is this, i want to catch that error and save it in a log, and this is more or less what i currently have: 关键是,我想捕获该错误并将其保存在日志中,这或多或少是我目前拥有的:
string[] ResponseArray = new string[2];
[WebMethod(Description = "blahblahblah", EnableSession = false)]
public string[] exampleWS(int param_1, int param_2, ... , int param_n)
{
try
{
"WSLogic and code"
}
catch(Exception Ex)
{
"Code to call error log (custom made error log for DB)"
ResponseArray[0] = Ex.Message;
ResponseArray[1] = "Error's Date and Time";
}
}
So if the user calls this WebService and for example, he forgets one parameter and leaves it null, user gets something like this: 因此,如果用户调用此WebService,例如,他忘记了一个参数并将其保留为空,则用户将获得如下所示的信息:
Cannot convert into System.Int32.
Parameter name: type -------> blah blah error message blah blah
What i want to do, is actually catch this message and call the log and register this error, but i do not know how to call an exception in this case since it does not even enter the Try/Catch code. 我要执行的操作实际上是捕获此消息并调用日志并记录此错误,但是在这种情况下我不知道如何调用异常,因为它甚至没有输入“尝试/捕获”代码。
In this case you may use nullable types . 在这种情况下,您可以使用可为null的类型 。 For example:
例如:
public string[] exampleWS(int? param_1, int? param_2, ... , int? param_n)
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