Question

我正在使用WCF，JSON和Windows窗体制作彩票程序。

基本上，目标是当用户单击表单上的爱尔兰乐透或乐透抽奖按钮时，使用返回并打印在表单上每个标签上的wcf服务生成6个唯一的随机数。数组的最小值是1，最大值分别是爱尔兰和乐透开奖的json值29和59。

编辑*

这里是作业简介。我不确定使用Json来回发送数据是什么意思。

回顾一下您作为起点创建的最后一个WCF服务和JSON任务。
以与执行此操作相同的方式创建WCF服务应用程序。
添加一种方法来创建一个从1到将要发送的值的随机数。
创建一个允许用户选择“乐透抽奖”或“爱尔兰乐透”的表格。
将所需数量的球发送到服务并获取一组随机数。在表单上显示这些。（两次抽奖都有不同数量的数字可供选择）
您的彩票表单必须使用WCF服务，并且不能直接在表单上进行随机数生成。使用JSON来回发送数据。
测试您的应用程序。

LottoService.svc.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;
using Newtonsoft.Json.Linq;
using Newtonsoft.Json;
using System.IO;

namespace WcfLottoServiceApp
{

public class LottoService : ILottoService
{

    public int GenerateLottoDrawNums()
    {
        //Create a new instance of JObject to parse the value from JSON file and use that as the max value for the array
        JObject myJsonFile = JObject.Parse(File.ReadAllText(@"C:\Users\davie\Documents\UniWork\Advanced Programing\Lab3LottoJSONProgram\WcfLottoService\WcfLottoServiceApp\Lotto.Json"));

        //set min/max value of array to 1 and the json file value which is 59;
        int min = 1;
        int max = (int)myJsonFile["LottoDraw"];

        //declare and initilize an array with 6 values
        int[] randomNums = new int[6];

        //create new instance of Random 
        Random rand = new Random();

        //i starts at 0, keep looping whilst i is less than the lengh of the array which is 6
        for (int i = 0; i < randomNums.Length; i++)
        {
            //values are initially stored in tempNum to be checked against the current values in the array
            int tempNum = rand.Next(min, max); 

            // IsDup is true, tempNum is the temporary 7th value in the array. ie. 
            //the array only stores 6 values but there is a 7th tempary number incase any of the initial 6 
            //values are the same. The 7th number will keep looping until it is unique and add to the array so there is 6 unique values. 
            while (IsDuplicate(tempNum, randomNums))
            {
                tempNum = rand.Next(7);
            }
            randomNums[i] = tempNum;



        }



        PrintTheArray(randomNums);
        return randomNums[0];

    }


    public int GenerateIrishLottoNums()
    {
        //Create a new insatnce of JObject to parse the value from JSON file and use that as the max value for the array
        JObject myJsonFile = JObject.Parse(File.ReadAllText(@"C:\Users\davie\Documents\UniWork\Advanced Programing\Lab3LottoJSONProgram\WcfLottoService\WcfLottoServiceApp\Lotto.Json"));

        //set min/max vlaue of array to 1 and the json file value whcih is 29. ;
        int min = 1;
        int max = (int)myJsonFile["IrishLotto"];



        //declare and initilize an array with 6 values
        int[] randomNums = new int[6];

        //create new instance of Random 
        Random rand = new Random();

        //i starts at 0, keep looping whilst i is less than the lengh of the array which is 6, i + 1 after each loop
        for (int i = 0; i < randomNums.Length; i++)
        {
            //values are initially stored in tempNum to be checked against the current values in the array
            int tempNum = rand.Next(min, max);

            // IsDup is true, tempNum is the temporary 7th value in the array. ie. 
            //the array only stores 6 values but there is a 7th temporary number incase any of the initial 6 
            //values are the same. The 7th number will keep looping until it is unique and add to the array so there is 6 unique values. 
            while (IsDuplicate(tempNum, randomNums))
            {
                tempNum = rand.Next(7);
            }
            randomNums[i] = tempNum;

        }

        PrintTheArray(randomNums);

        return randomNums[0];


    }

    //Print the array to console to check if the numbers are gnerating and correct.
    private void PrintTheArray(int[]randomNums)
    {
        foreach (var item in randomNums)
        {
            Console.WriteLine(item);
        }
    }

    //This method returns true or false and checks whether the items in the array are a duplicate with the tempNum if yes then IsDup is true.
    public Boolean IsDuplicate(int tempNum, int[]randomNum)
    {
        foreach (var item in randomNum)
        {
            if (item == tempNum)
            {
                return true;
            }
        }
        return false;
    }
}
}

ILottoService.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;

namespace WcfLottoServiceApp
 {

//NOTE: You can use the "Rename" command on the "Refactor" menu to change   
the interface name "ILottoService" in both code and config file together.

[ServiceContract]
public interface ILottoService
{

    [OperationContract]

    int GenerateLottoDrawNums();

    [OperationContract]

    int GenerateIrishLottoNums();



}


}

FrontEndForm

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Newtonsoft.Json.Linq;
using Newtonsoft.Json;
using System.IO;

namespace Lotto_FrontEnd_Wcf_Json
{
public partial class FrontEnd : Form
{
    LottoServiceReference.LottoServiceClient ws = null;
    public FrontEnd()
    {
        InitializeComponent();
    }

    private void FrontEnd_Load(object sender, EventArgs e)
    {
        ws = new LottoServiceReference.LottoServiceClient();
    }

    private void btnLotto_Click(object sender, EventArgs e)
    {


    }

    private void btnIrishLotto_Click_1(object sender, EventArgs e)
    {

    }
}
}

JSON文件

{
"LottoDraw": 59,


"IrishLotto": 29
}

目前，当运行wcf时，单击invoke时，程序仅返回一个随机值。一旦我可以返回整个数组，就可以将值打印到表格上的标签上。

我使用WCF和JSon的原因是为了分配，而不是选择。

我认为我没有为[OperationContract]输入任何参数是错的吗？

显然，我只返回数组的单个项目，但我不知道如何返回全部。我只是想知道，它每次都会生成一个随机数，当我将randomNums [0]更改为[1]时，它也会更改，所以这很好吗？

什么都没有打印到控制台上，它并不需要我只是尝试了一下并且没有将它取出来。

我认为这很清楚，如果不是的话，我们深表歉意

我只是了解wcf和json，所以我的知识非常基础。

在此先感谢您的任何建议或朝正确方向的指示！

Answer 1

简单一个。

只需更改GenerateLottDrawNums的签名即可返回数组：

[OperationContract]
int[] GenerateLottoDrawNums();

并更改实现以返回整个数组，而不是第一个元素

public int[] GenerateLottoDrawNums()
{
     // (...)
    //declare and initilize an array with 6 values
    int[] randomNums = new int[6];
    // (...)
    return randomNums;
}

如何使用WCF返回所有数组项，而不是单个数组项

1 个答案: