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我正在尝试在我的控制器中编写代码，该代码在运行时将创建一堆变量，然后使用具有占位符以包含变量的模板发送电子邮件。但是，它将用户帐户中的信息分配给变量，如果用户尚未填写该信息，它将崩溃。作为一种解决方法，我在 if 语句中声明了它们，以确保它们首先不为空。但是现在当我尝试将它们传递给电子邮件模板时，它告诉我该变量不存在。如果我删除 if 语句，它会再次起作用。任何想法为什么？

代码如下...

if (UserContext != null && UserContext.Account != null)
        {

            if (UserContext.UserName != null)
            { string UserName = string.Format(UserContext.UserName); }

            if (UserContext.EmailAddress != null)
            { string EmailAddress = string.Format(UserContext.EmailAddress); }

            if (UserContext.Account.PrimaryContactFirstName != null)
            { string FirstName = string.Format(UserContext.Account.PrimaryContactFirstName); }

            if (UserContext.Account.PrimaryContactLastName != null)
            { string LastName = string.Format(UserContext.Account.PrimaryContactLastName); }

            if (UserContext.Account.PrimaryContactPhoneNumber != null)
            { string PhoneNumber = string.Format(UserContext.Account.PrimaryContactPhoneNumber); }

            if (UserContext.Account.HeadquartersAddressLine1 != null)
            {
                string AddressLine1 = string.Format(UserContext.Account.HeadquartersAddressLine1);

                if (UserContext.Account.HeadquartersAddressLine2 != null)
                { string AddressLine2 = string.Format(UserContext.Account.HeadquartersAddressLine2); }
            }

            if (UserContext.Account.HeadquartersCity != null)
            { string City = string.Format(UserContext.Account.HeadquartersCity); }

            if (UserContext.Account.HeadquartersState != null)
            { string State = string.Format(UserContext.Account.HeadquartersState); }

            if (UserContext.Account.HeadquartersZip != null)
            { string ZipCode = string.Format(UserContext.Account.HeadquartersZip); }

            if (UserContext.Account.Name != null)
            { string Name = string.Format(UserContext.Account.Name); }

            string body = string.Format(Resources.ContactUsLoggedInEmailTemplate, model.FirstName, model.LastName, model.PhoneNumber, model.Email, model.ReasonForContact, model.Message, UserName, EmailAddress, FirstName, LastName, PhoneNumber, AddressLine1, AddressLine2, City, State, ZipCode, Name);

            string subject = string.Format("Web Submit: {0}", model.ReasonForContact);

            EmailHelper.SendEmail("support@website.com", subject, body, true);

        }
        if (UserContext == null)
        {
            string body = string.Format(Resources.ContactUsEmailTemplate, model.FirstName, model.LastName, model.PhoneNumber, model.Email, model.ReasonForContact, model.Message);

            string subject = string.Format("Web Submit: {0}", model.ReasonForContact);

            EmailHelper.SendEmail("support@website.com", subject, body, true);
        }

        return RedirectToAction("ContactConfirmation");
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2 回答 2

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每个变量仅在创建它的块的生命周期内存在。当每个if区块结束时，它们会立即消失。解决方案是先声明所有变量，然后根据需要分配值。

try这是/catch块的常见烦恼之一。任何以后可能有用的东西都需要在try. 如果构造函数可能抛出异常，那么它应该在try块内。

于 2012-06-11T02:49:15.077 回答
1

因为您在 If 语句中声明变量，所以一旦 If 语句完成，它们就会消失。在顶部声明变量（例如：string body;，在任何 if 检查之前），然后您应该能够将它们传递到您的电子邮件中。

string UserName;
string EmailAddress;
string FirstName;
....
if (UserContext != null && UserContext.Account != null)
        {

            if (UserContext.UserName != null)
            { UserName = string.Format(UserContext.UserName); }

            if (UserContext.EmailAddress != null)
            { EmailAddress = string.Format(UserContext.EmailAddress); }

            if (UserContext.Account.PrimaryContactFirstName != null)
            { FirstName = string.Format(UserContext.Account.PrimaryContactFirstName); }

            if (UserContext.Account.PrimaryContactLastName != null)
            { LastName = string.Format(UserContext.Account.PrimaryContactLastName); }

            if (UserContext.Account.PrimaryContactPhoneNumber != null)
            { PhoneNumber = string.Format(UserContext.Account.PrimaryContactPhoneNumber); }

            if (UserContext.Account.HeadquartersAddressLine1 != null)
            {
                AddressLine1 = string.Format(UserContext.Account.HeadquartersAddressLine1);

                if (UserContext.Account.HeadquartersAddressLine2 != null)
                { AddressLine2 = string.Format(UserContext.Account.HeadquartersAddressLine2); }
            }

            if (UserContext.Account.HeadquartersCity != null)
            { City = string.Format(UserContext.Account.HeadquartersCity); }

            if (UserContext.Account.HeadquartersState != null)
            { State = string.Format(UserContext.Account.HeadquartersState); }

            if (UserContext.Account.HeadquartersZip != null)
            { ZipCode = string.Format(UserContext.Account.HeadquartersZip); }

            if (UserContext.Account.Name != null)
            { Name = string.Format(UserContext.Account.Name); }

            string body = string.Format(Resources.ContactUsLoggedInEmailTemplate, model.FirstName, model.LastName, model.PhoneNumber, model.Email, model.ReasonForContact, model.Message, UserName, EmailAddress, FirstName, LastName, PhoneNumber, AddressLine1, AddressLine2, City, State, ZipCode, Name);

            string subject = string.Format("Web Submit: {0}", model.ReasonForContact);

            EmailHelper.SendEmail("support@website.com", subject, body, true);

        }
        if (UserContext == null)
        {
            body = string.Format(Resources.ContactUsEmailTemplate, model.FirstName, model.LastName, model.PhoneNumber, model.Email, model.ReasonForContact, model.Message);

            subject = string.Format("Web Submit: {0}", model.ReasonForContact);

            EmailHelper.SendEmail("support@website.com", subject, body, true);
        }

        return RedirectToAction("ContactConfirmation");
于 2012-06-11T02:50:08.817 回答