索引超出范圍。 必須為非負數並且小於集合的大小。 參數名稱：索引

Question

所以我遇到這個問題，有人試圖加載沒有電子郵件地址的頁面，而我卻很難找到解決方法。

//getting email address for current user
    IIdentity id = WindowsIdentity.GetCurrent();
    WindowsIdentity winId = id as WindowsIdentity;
    if (id != null)
    {
        userName = winId.Name;

        string userInQuestion = userName.Split('\\')[1];
        string myDomain = userName.Split('\\')[0]; // this is the domain that the user is in
        // the account that this program runs in should be authenticated in there                    

        using (HostingEnvironment.Impersonate())
        {
            DirectoryEntry entry = new DirectoryEntry("LDAP://" + myDomain);
            DirectorySearcher adSearcher = new DirectorySearcher(entry);

            adSearcher.SearchScope = SearchScope.Subtree;
            adSearcher.Filter = "(&(objectClass=user)(samaccountname=" + userInQuestion + "))";
            SearchResult userObject = adSearcher.FindOne();
            if (userObject != null)
            {
                string[] props = new string[] { "mail"};
                {
                    foreach (string prop in props)
                    {
                        if (userObject.Properties[prop][0].ToString() != "")
                        {
                            CurrentUserEmail = userObject.Properties[prop][0].ToString();
                        }
                        else
                        {
                            CurrentUserEmail = "";
                        }
                    }

                }
            }

        }
    }

這是我得到的堆棧跟蹤信息，我了解有些提交此表單的人可能沒有電子郵件地址，但我似乎找不到解決該問題的方法。 if else語句是我最近的嘗試，但錯誤仍然存​​在。

Answer 1

您的問題是[0]中userObject.Properties[prop][0].ToString()

如果數組為空； 即沒有元素，那么您將收到錯誤。 嘗試

CurrentUserEmail = "";
var propertyArray = userObject.Properties[prop];
if (propertyArray.Lenght > 0) CurrentUserEmail = propertyArray[0] as string;

Answer 2

為什么不捕獲異常並在catch塊中將電子郵件地址分配給“”？