你可以使用Convert.ChangeType():

public static T ConfigSetting<T>(string settingName)
{
    return (T)Convert.ChangeType(ConfigurationManager.AppSettings[settingName], typeof(T));
}

你需要让它成为一个泛型方法，就像这样:

public static T ConfigSetting<T>(string settingName)
{  
    return /* code to convert the setting to T... */
}

但是调用者必须指定他们所期望的类型。然后，您可能会使用Convert。ChangeType，假设所有相关类型都被支持:

public static T ConfigSetting<T>(string settingName)
{  
    object value = ConfigurationManager.AppSettings[settingName];
    return (T) Convert.ChangeType(value, typeof(T));
}

请注意，我并不完全相信这是个好主意……

有很多方法可以做到这一点(按优先级列出，具体到OP的问题)

Option 1: Straight approach - Create multiple functions for each type you expect rather than having one generic function. public static bool ConfigSettingInt(string settingName) { return Convert.ToBoolean(ConfigurationManager.AppSettings[settingName]); } Option 2: When you don't want to use fancy methods of conversion - Cast the value to object and then to generic type. public static T ConfigSetting<T>(string settingName) { return (T)(object)ConfigurationManager.AppSettings[settingName]; } Note - This will throw an error if the cast is not valid(your case). I would not recommend doing this if you are not sure about the type casting, rather go for option 3. Option 3: Generic with type safety - Create a generic function to handle type conversion. public static T ConvertValue<T,U>(U value) where U : IConvertible { return (T)Convert.ChangeType(value, typeof(T)); } Note - T is the expected type, note the where constraint here(type of U must be IConvertible to save us from the errors)

请尝试以下代码:

public T? GetParsedOrDefaultValue<T>(string valueToParse) where T : struct, IComparable
{
 if(string.EmptyOrNull(valueToParse))return null;
  try
  {
     // return parsed value
     return (T) Convert.ChangeType(valueToParse, typeof(T));
  }
  catch(Exception)
  {
   //default as null value
   return null;
  }
 return null;
}

创建一个函数，并以泛型类型传递输出参数。

 public static T some_function<T>(T output_object /*declare as Output object*/)
    {
        return output_object;
    }

你可以使用Convert.ChangeType():

public static T ConfigSetting<T>(string settingName)
{
    return (T)Convert.ChangeType(ConfigurationManager.AppSettings[settingName], typeof(T));
}