如何将json绑定到listview控件答案

【问题标题】：how to bind json to listview control如何将json绑定到listview控件
【发布时间】：2017-02-16 20:58:45
【问题描述】：

谁能帮助我如何将 JSON 数据绑定到列表视图控件。 JSON就是这种格式，是重新序列化的数据表：

[  
   {  
      "Ch_ID":"27",
      "User_id":"1",
      "Ch_Name":"test1",
      "Ch_Description":"test1description",
      "Ch_Starttime":""
   },
   {  
      "Ch_ID":"29",
      "User_id":"1",
      "Ch_Name":"w",
      "Ch_Description":"ww",
      "Ch_Starttime":"12"
   },
   {  
      "Ch_ID":"30",
      "User_id":"1",
      "Ch_Name":"qq",
      "Ch_Description":"qqqdescription",
      "Ch_Starttime":"1222"
   },
   {  
      "Ch_ID":"31",
      "User_id":"1",
      "Ch_Name":"v",
      "Ch_Description":"vv",
      "Ch_Starttime":"1"
   },
   {  
      "Ch_ID":"32",
      "User_id":"1",
      "Ch_Name":"n",
      "Ch_Description":"nnnn",
      "Ch_Starttime":"111"
   }
]

我该如何解决？

【问题讨论】：

我什么都没做，我没有想法
尝试查看这些帖子，看看它们是否有助于您的思考 - json-data-to-listview - binding-data-from-json
这个答案没有用吗？ stackoverflow.com/questions/6487421/…
格式化后容易得多。 jsonformatter.curiousconcept.com

标签： c# asp.net json vb.net

【解决方案1】：

您必须创建一个与 JSON 文件具有相同属性的类，然后反序列化为该类的实例。将其添加到列表中并从那里使用列表。这是一个例子。

class Person
{
    public int Ch_ID { get; set; }
    public int User_id{ get; set; }
    public string Ch_Name { get; set; }
    // all properties...
    public override string ToString()
    {
        return string.Format("User ID: {0} \n Name: {1}", User_id, Ch_Name);
    }
}
class Program
{
    static void Main(string[] args)
    {
        // Parsing into a class from JSON file using JavaScriptSerializer class
        string path = "C:\\path\\";
        // Deserialize JSON from file.
        String JSONfile = File.ReadAllText(path + "JSON.json");
        JavaScriptSerializer ser = new JavaScriptSerializer();
        Person p1 = ser.Deserialize<Person>(JSONfile);
        Console.WriteLine(p1);

        List<Person> newList = new List<Person>();
        // add instance of the class to the list
        newList.Add(p1);
        // do work whith your list...
    }
}

【讨论】：

【解决方案2】：

下面列出了一些观察结果。

第 1 步：将 JSON 字符串转换为 .NET 对象

一般JSON字符串包含很多双引号(")，但在C#中双引号有特殊含义，表示字符串的开始和结束。

如下所示，给定的 json 字符串包含许多双引号，但这些是该字符串的一部分，我们不想将其视为字符串的开头和结尾，我们需要对其进行转义。

[

 {"Ch_ID":"27","User_id":"1","Ch_Name":"test1","Ch_Description":"test1description","Ch_Starttime":""},

 {"Ch_ID":"29","User_id":"1","Ch_Name":"w","Ch_Description":"ww","Ch_Starttime":"12"},

 {"Ch_ID":"30","User_id":"1","Ch_Name":"qq","Ch_Description":"qqqdescription","Ch_Starttime":"1222"},
 {"Ch_ID":"31","User_id":"1","Ch_Name":"v","Ch_Description":"vv","Ch_Starttime":"1"},
 {"Ch_ID":"32",User_id":"1","Ch_Name":"n","Ch_Description":"nnnn","Ch_Starttime":"111"}

]

步骤 1.1：将双引号 (") 替换为反斜杠双引号 (")。

按 CTRL+H 并将 " 替换为 "。替换后的 json 字符串如下所示。

[

 {\"Ch_ID\":\"27\",\"User_id\":\"1\",\"Ch_Name\":\"test1\",\"Ch_Description\":\"test1description\",\"Ch_Starttime\":\"\"},

 {\"Ch_ID\":\"29\",\"User_id\":\"1\",\"Ch_Name\":\"w\",\"Ch_Description\":\"ww\",\"Ch_Starttime\":\"12\"},

 {\"Ch_ID\":\"30\",\"User_id\":\"1\",\"Ch_Name\":\"qq\",\"Ch_Description\":\"qqqdescription\",\"Ch_Starttime\":\"1222\"},
 {\"Ch_ID\":\"31\",\"User_id\":\"1\",\"Ch_Name\":\"v\",\"Ch_Description\":\"vv\",\"Ch_Starttime\":\"1\"},
 {\"Ch_ID\":\"32\",User_id\":\"1\",\"Ch_Name\":\"n\",\"Ch_Description\":\"nnnn\",\"Ch_Starttime\":\"111\"}

]

步骤1.2：用替换字符串声明字符串变量，如下所示

 //Showing stringJSON in single line
// First double quotes in below line indicates beginning of JSON string and last    Double quotes indicate end of the string
// Other Doubles quotes are part of the string , they are precededby backslash so we are escaping that double quotes

 string jsonString = "[{\"ID\":\"27\",\"UserID\":\"1\",\"Name\":\"test1\",\"Description\":\"test1description\",\"StartTime\":\"\"},{\"ID\":\"29\",\"UserID\":\"1\",\"Name\":\"w\",\"Description\":\"ww\",\"StartTime\":\"12\"},{\"ID\":\"30\",\"UserID\":\"1\",\"Name\":\"qq\",\"Description\":\"qqqdescription\",\"StartTime\":\"1222\"},{\"ID\":\"31\",\"UserID\":\"1\",\"Name\":\"v\",\"Description\":\"vv\",\"StartTime\":\"1\"},{\"ID\":\"32\",\"UserID\":\"1\",\"Name\":\"n\",\"Description\":\"nnn\",\"StartTime\":\"111\"}]";

在 Visual Studio IDE 中，同样的语句也可以多行声明，如下所示。

 string jsonString = "[{\"ID\":\"27\",\"UserID\":\"1\",\"Name\":\"test1\",\"Description\":\"test1description\",\"StartTime\":\"\"} " +
                 " ,"  + " {\"ID\":\"29\",\"UserID\":\"1\",\"Name\":\"w\",\"Description\":\"ww\",\"StartTime\":\"12\"}" +
                "," + " {\"ID\":\"30\",\"UserID\":\"1\",\"Name\":\"qq\",\"Description\":\"qqqdescription\",\"StartTime\":\"1222\"}" +
                "," + "{\"ID\":\"31\",\"UserID\":\"1\",\"Name\":\"v\",\"Description\":\"vv\",\"StartTime\":\"1\"}" +
                "," + "{\"ID\":\"32\",\"UserID\":\"1\",\"Name\":\"n\",\"Description\":\"nnn\",\"StartTime\":\"111\"}]";

第二步

我们要将上面的 JSON 字符串转换为 .net 对象。 JSON 字符串包含 5 个员工对象，因此使用 System.Web.Script.Serialization 命名空间中可用的 JavaScriptSerializer 的 Deserialize() 方法构造一个员工对象列表。

步骤 2.2

以属性的形式声明一个具有上述JSON字符串字段的类，如下所示（为简单起见，StartTime被声明为字符串而不是DateTime）

public class Employee
    {

        public string ID { get; set; }
        public string UserID { get; set; }
        public string Name { get; set; }
        public string Description { get; set; }
        public string StartTime { get; set; }

    }

步骤 2.3

创建一个 JavaScriptSerializer 实例，有两个参数，第一个参数作为 Jsonstring 传递，第二个参数我们必须指定结果对象的类型（即员工列表）。使用员工列表进行类型转换并存储在列表中雇员对象如下所示。

JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer();
List<Employee> listEmployee=  (List<Employee>)javaScriptSerializer.Deserialize(jsonString, typeof(List<Employee>));

第三步

将员工列表转换为数据表并绑定到数据网格（使用数据网格而不是列表视图，因为它具有更多功能，例如绑定字段和模板字段

DataTable dt1=  ConvertToDatatable(listEmployee);

步骤 3.1

下面列出了转换为数据表的函数

static DataTable ConvertToDatatable(List<Employee> list)
        {
            DataTable dt = new DataTable();

            dt.Columns.Add("ID");
            dt.Columns.Add("UserID");
            dt.Columns.Add("Name");
            dt.Columns.Add("Description");
            dt.Columns.Add("StartTime");

            foreach (var item in list)
            {
                var row = dt.NewRow();

                row["ID"] = item.ID;
                row["UserID"] = item.UserID;
                row["Name"] = item.Name;
                row["Description"] = item.Description;
                row["StartTime"] = item.StartTime;


                dt.Rows.Add(row);
            }

            return dt;
        }

第四步

声明一个 DataGrid 。 .aspx 页面如下所示

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="3"  BackColor="#DEBA84" BorderColor="#DEBA84" BorderStyle="None" BorderWidth="1px" CellSpacing="2">
            <Columns>
                <asp:BoundField DataField="ID" HeaderText="ID" />
                <asp:BoundField DataField="UserID" HeaderText="User  ID" />
                <asp:BoundField DataField="Name" HeaderText="Name" />
                <asp:BoundField DataField="Description" HeaderText="Description" />
                <asp:BoundField DataField="StartTime" HeaderText="Start Time" />
               </Columns>
            <FooterStyle BackColor="#F7DFB5" ForeColor="#8C4510" />
            <HeaderStyle BackColor="#A55129" Font-Bold="True" ForeColor="White" />
            <PagerStyle ForeColor="#8C4510" HorizontalAlign="Center" />
            <RowStyle BackColor="#FFF7E7" ForeColor="#8C4510" />
            <SelectedRowStyle BackColor="#738A9C" Font-Bold="True" ForeColor="White" />
            <SortedAscendingCellStyle BackColor="#FFF1D4" />
            <SortedAscendingHeaderStyle BackColor="#B95C30" />
            <SortedDescendingCellStyle BackColor="#F1E5CE" />
            <SortedDescendingHeaderStyle BackColor="#93451F" />
        </asp:GridView>

第四步。

如下图将数据表与Gridview绑定

GridView1.DataSource = dt1; GridView1.DataBind();

步骤 4.1。

所有功能都在页面中的按钮点击事件上执行，如下所示：

 protected void Button1_Click(object sender, EventArgs e)
        {


            //Showing stringJSON in single line
            // First double quotes in below line indicates beginning of JSON string and last Double quotes indicate end of the string
            // Other Doubles quotes are part of the string , they are precededby backslash so we are escaping that double quotes
            //string jsonString = "[{\"ID\":\"27\",\"UserID\":\"1\",\"Name\":\"test1\",\"Description\":\"test1description\",\"StartTime\":\"\"},{\"ID\":\"29\",\"UserID\":\"1\",\"Name\":\"w\",\"Description\":\"ww\",\"StartTime\":\"12\"},{\"ID\":\"30\",\"UserID\":\"1\",\"Name\":\"qq\",\"Description\":\"qqqdescription\",\"StartTime\":\"1222\"},{\"ID\":\"31\",\"UserID\":\"1\",\"Name\":\"v\",\"Description\":\"vv\",\"StartTime\":\"1\"},{\"ID\":\"32\",\"UserID\":\"1\",\"Name\":\"n\",\"Description\":\"nnn\",\"StartTime\":\"111\"}]";
            //Showing stringJSON in multi  line
            string jsonString = "[{\"ID\":\"27\",\"UserID\":\"1\",\"Name\":\"test1\",\"Description\":\"test1description\",\"StartTime\":\"\"} " +
                 " ,"  + " {\"ID\":\"29\",\"UserID\":\"1\",\"Name\":\"w\",\"Description\":\"ww\",\"StartTime\":\"12\"}" +
                "," + " {\"ID\":\"30\",\"UserID\":\"1\",\"Name\":\"qq\",\"Description\":\"qqqdescription\",\"StartTime\":\"1222\"}" +
                "," + "{\"ID\":\"31\",\"UserID\":\"1\",\"Name\":\"v\",\"Description\":\"vv\",\"StartTime\":\"1\"}" +
                "," + "{\"ID\":\"32\",\"UserID\":\"1\",\"Name\":\"n\",\"Description\":\"nnn\",\"StartTime\":\"111\"}]";


          JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer();
         List<Employee> listEmployee=  (List<Employee>)javaScriptSerializer.Deserialize(jsonString, typeof(List<Employee>));

            // convert list of employees to datatable

          DataTable dt1=  ConvertToDatatable(listEmployee);


            // Bind to datagrid 
            GridView1.DataSource = dt1;
            GridView1.DataBind();





        }

注意：在使用 JSON 字符串时，检查 JSON 字符串的有效性很重要。如果没有给出有效的 JSOn 字符串，程序将无法按预期运行。

在线工具jsonformatter可以用来检查JSON字符串的有效性。(https://jsonformatter.curiousconcept.com/)

【讨论】：

【解决方案3】：

string json = "[{\"ID\":\"27\",\"UserID\":\"1\",\"Name\":\"test1\",\"Description\":\"test1description\",\"StartTime\":\"\"},{\"ID\":\"29\",\"UserID\":\"1\",\"Name\":\"w\",\"Description\":\"ww\",\"StartTime\":\"12\"},{\"ID\":\"30\",\"UserID\":\"1\",\"Name\":\"qq\",\"Description\":\"qqqdescription\",\"StartTime\":\"1222\"},{\"ID\":\"31\",\"UserID\":\"1\",\"Name\":\"v\",\"Description\":\"vv\",\"StartTime\":\"1\"},{\"ID\":\"32\",\"UserID\":\"1\",\"Name\":\"n\",\"Description\":\"nnn\",\"StartTime\":\"111\"}]";

var obj = (Newtonsoft.Json.Linq.JArray)JsonConvert.DeserializeObject(json);

List<Employee> employees = (obj).Select(x => new Employee
{
    ID = (string)x["ID"],
    UserID = (string)x["UserID"]
}).ToList();

foreach (var emp in employees)
{
    lvNewData.Items.Add(emp.ID);
    // add other things
}

【讨论】：