Question

可能重复：
How to Capitalize names using C#

如何以首字母大写格式从数据库表中检索值？

我的LINQ查询是这样的，

            DBEntities Context = new DBEntities ();    
            var UserNameEntity = (from a in Context.UserInformation
                                  where a.UserId == UserId
                                  select a).First();
            string UserName = UserNameEntity.FirstName + " " + UserNameEntity.LastName;   

            return UserName;

我收到用户名：bhargav soni

但我希望这应该像Bhargav Soni

我该怎么做？

Answer 1

这个问题与LINQ无关，但你可以这样做的方法是

TextInfo myTI = CultureInfo.CurrentCulture.TextInfo;

DBEntities Context = new DBEntities ();    
var UserNameEntity = (from a in Context.UserInformation
                     where a.UserId == UserId
                    select a).First();
string UserName = string.Format("{0} {1}", myTI.ToTitleCase(UserNameEntity.FirstName), myTI.ToTitleCase(UserNameEntity.LastName));   

return UserName;

Answer 2

在FirstName和LastName属性上，使用索引器检索第一个字符，然后调用Substring()方法检索字符串的其余部分。

DBEntities Context = new DBEntities ();  
var UserNameEntity = (from a in Context.UserInformation
                     where a.UserId == UserId
                     select a).First();
string UserName = char.ToUpper(UserNameEntity.FirstName[0])
                  + UserNameEntity.FirstName.Substring(1)
                  + " "
                  + char.ToUpper(UserNameEntity.LastName[0])
                  + UserNameEntity.LastName.Substring(1);

return UserName;

这假设两个属性的长度至少为两个字符。

您也可以完全在LINQ中执行此操作：

DBEntities Context = new DBEntities ();  
IEnumerable<string> userNames = from a in Context.UserInformation
                                where a.UserId == UserId
                                let firstName = a.FirstName
                                let lastName = a.LastName
                                select (char.ToUpper(firstName[0])
                                    + firstName.Substring(1)
                                    + " "
                                    + char.ToUpper(lastName[0])
                                    + lastName.Substring(1));

return displayNames.First();

显然，使用String.Format代替连接可能会也可能不会提高可读性。

Answer 3

String类不包含将字符串转换为标题大小写的方法。 ToTitleCase方法驻留在TextInfo类中，该类是System.Globalization命名空间的成员。与String类的ToUpper和ToLower方法不同，ToTitleCase方法不是静态方法，需要类的实例。

    CultureInfo cultureInfo   = Thread.CurrentThread.CurrentCulture;
    TextInfo textInfo = cultureInfo.TextInfo;

    DBEntities Context = new DBEntities ();    
                var UserNameEntity = (from a in Context.UserInformation
                                      where a.UserId == UserId
                                      select a).First();
                string UserName = textInfo.ToTitleCase(UserNameEntity.FirstName) + " " + 
textInfo.ToTitleCase(UserNameEntity.LastName);   

                return UserName;

检查以获取详细信息： How to convert strings to lower, upper, or title (proper) case by using Visual C#

如何使用LINQ Query从数据库表中检索值，首字母大写？

3 个答案: