[英]How to assign data in an ArrayList from another class in c#
arraylist
数据? public class PlatanoJson //this is first class where arraylist is declared
{
public string question { get; set; }
public string correctans { get; set; }
public bool typeofans { get; set; }
public int indexofque { get; set; }
public ArrayList DiffAns = new ArrayList();
}
public class JsonSerializationController : ApiController
{
[Route("getjsondata")]
public string jsonDataToSerialize()
{
var game = new PlatanoJson {
question = "What is your education?",
correctans = "MCA",
typeofans = true,
indexofque = 3,
DiffAns = //how to add data here??
};
var result = Newtonsoft.Json.JsonConvert.SerializeObject(game);
var dresult = Newtonsoft.Json.JsonConvert.DeserializeObject<PlatanoJson>(result);
return (" Question="+dresult.question+" Correct Answer="+dresult.correctans+" Type of ans="+dresult.typeofans+" Index of Que"+dresult.indexofque+" Answers choice="+dresult.DiffAns);
}
}
由于ArrayList
不会对包含的数据做任何假设,因此可以向其中添加任何数据类型。 为此,有几种可能性,例如使用对象初始化程序:
var game = new PlatanoJson {
question = "What is your education?",
correctans = "MCA",
typeofans = true,
indexofque = 3,
DiffAns = new ArrayList { 1, 2, 3, "myString" }
};
另外,您也可以使用期望ICollection
的构造函数:
DiffAns = new ArrayList(new object[] { 1, 2, 3, "myString" })
但是,我建议您花些时间并改用通用方法。 使用ArrayList
您无法限制列表中可能包含的对象,可以(如在上面的代码中看到的)将inetegeres,字符串和任何其他数据类型放入其中。 更好地使用List<T>
,它为您提供编译时类型安全性:
var game = new PlatanoJson {
question = "What is your education?",
correctans = "MCA",
typeofans = true,
indexofque = 3,
DiffAns = new List<int>{ 1, 2, 3 } // you van´t put a string into this list
};
您为什么不将代码更改为以下内容(如果列表包含字符串)。
public class PlatanoJson //this is first class where arraylist is declared{
public string question { get; set; }
public string correctans { get; set; }
public bool typeofans { get; set; }
public int indexofque { get; set; }
public List<string> DiffAns { get; set; }
}
public class JsonSerializationController : ApiController
{
[Route("getjsondata")]
public string jsonDataToSerialize()
{
var list= new List<string>();
list.Add("your stuff1");
list.Add("your stuff2");
list.Add("your stuff3");
var game = new PlatanoJson {
question = "What is your education?",
correctans = "MCA",
typeofans = true,
indexofque = 3,
DiffAns = list;
};
var result = Newtonsoft.Json.JsonConvert.SerializeObject(game);
var dresult = Newtonsoft.Json.JsonConvert.DeserializeObject<PlatanoJson> (......................
}
}
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