c# - Properties.Settings has no setter

Question

I decided to use Properties.Settings to store some application settings for my ASP.net project. However, when trying to modify the data, I get an error The property 'Properties.Settings.Test' has no setter, since this is generated I have no idea what I should do to change this as all my previous C# Projects have not had this issues.

Answer 1

我的猜测是您使用Application范围而不是User范围定义了属性。应用程序级属性是只读的，并且只能在web.config文件中进行编辑。

我根本不会Settings在 ASP.NET 项目中使用该类。当您写入web.config文件时，ASP.NET/IIS 会回收 AppDomain。如果您定期编写设置，您应该使用其他一些设置存储（例如您自己的 XML 文件）。

Answer 2

正如 Eli Arbel 已经说过的，您无法从应用程序代码中修改 web.config 中编写的值。您只能手动执行此操作，但随后应用程序将重新启动，这是您不想要的。

这是一个简单的类，您可以使用它来存储值并使它们易于阅读和修改。如果您从 XML 或数据库读取数据，并且取决于您是否要永久存储修改后的值，只需更新代码以满足您的需求。

public class Config
{
    public int SomeSetting
    {
        get
        {
            if (HttpContext.Current.Application["SomeSetting"] == null)
            {
                //this is where you set the default value 
                HttpContext.Current.Application["SomeSetting"] = 4; 
            }

            return Convert.ToInt32(HttpContext.Current.Application["SomeSetting"]);
        }
        set
        {
            //If needed add code that stores this value permanently in XML file or database or some other place
            HttpContext.Current.Application["SomeSetting"] = value;
        }
    }

    public DateTime SomeOtherSetting
    {
        get
        {
            if (HttpContext.Current.Application["SomeOtherSetting"] == null)
            {
                //this is where you set the default value 
                HttpContext.Current.Application["SomeOtherSetting"] = DateTime.Now;
            }

            return Convert.ToDateTime(HttpContext.Current.Application["SomeOtherSetting"]);
        }
        set
        {
            //If needed add code that stores this value permanently in XML file or database or some other place
            HttpContext.Current.Application["SomeOtherSetting"] = value;
        }
    }
}

Answer 3

这里：http: //msdn.microsoft.com/en-us/library/bb397755.aspx

是您问题的解决方案。