JSON 用组合框替换文本框时遇到错误

Question

我对 Visual Studio 很陌生。我正在编写一个程序，当输入员工姓名并单击“获取用户”按钮时，它将从 API 检索员工的签名（例如，如果输入员工姓名 Jane Doe，则签名“JNDO”将从 API 字符串中检索。

使用文本框输入姓名时，所需信息读取成功。但是，当我用组合框替换文本框以在用户键入时建议名称时，我收到以下错误：

Newtonsoft.Json.JsonReaderException: 'Unexpected character encountered while parsing value: <. Path '', line 0, position 0.' This exception was originally thrown at this call stack: [External Code] TimeSheets_Try_11.Controllers.WebAPI.Getsignature(string) in WebAPI.cs TimeSheets_Try_11.Form1.button1_Click(object, System.EventArgs) in Form1.cs [External Code] TimeSheets_Try_11.Program.Main() in Program.cs

通过使用断点来理解值，它表示

String is not JSON formatted <!doctype html>

我的JSON字符串：

[{"signature":"JNDO","firstName":"Jane","fullName":"Doe, Jane","lastName":"Doe"}]

我的 windows 表格代码：

namespace TimeSheets_Try_11

{
    public partial class Form1 : Form
    {
        WebAPI WA = new WebAPI();
      

        public Form1()
        {
            InitializeComponent();
            webBrowser1.Url = new Uri(StaticStrings.UrlIora);
        }

        private void label1_Click(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {


            comboBox1.DataSource = WA.Getsignature(textBox2.Text);


        }

        private void textBox2_TextChanged(object sender, EventArgs e)
        {

        }

       
        private void Form1_Load(object sender, EventArgs e)
        {
            
        }

        private void button1_Click(AutoCompleteStringCollection combData)
        {
            
            
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            
        }

        private void button2_Click(object sender, EventArgs e)
        {
            this.Hide();
            Form2 p = new Form2();
            p.ShowDialog(); 
        }
    }
}

调用我的代码 JSON

namespace TimeSheets_Try_11.Controllers
{
    class WebAPI
    {
       

        public string Getsignature(string name)
        {

            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

            var cookies = FullWebBrowserCookie.GetCookieInternal(new Uri(StaticStrings.UrlIora), false);
            WebClient wc = new WebClient();
            wc.Encoding = System.Text.Encoding.UTF8;
            wc.Headers.Add("Cookie:" + cookies);
            wc.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
            wc.UseDefaultCredentials = true;
            string uri = "";

            uri = StaticStrings.UrlIora + name;

            var myJsonResponse = wc.DownloadString(uri);

            Root myDeserializedClass = JsonConvert.DeserializeObject<Root>(myJsonResponse);

            string signame = myDeserializedClass.ToString();
            return signame;

        }
}

定义我的变量的代码JSON:

namespace TimeSheet_Try11_Models
{

    public class Employeename
        {
            public string signature { get; set; }
            public string firstName { get; set; }
            public string fullName { get; set; }
            public string lastName { get; set; }
        
        }


    public class Root
    {
        public List<Employeename> Employeename { get; set; }
    }
   
}

Answer 1

我个人不会将文本框换成组合来提供自动完成功能，我会将文本框的 AutoCompleteMode 设置为例如SuggestAppend 并将其 AutoCompleteSource 设置为例如CustomSource 然后将它的 AutoCompleteCustomSource 设置为一个 AutoCompleteStringCollection 由类似于你的 API 的东西构建，响应所有名字的列表

var acsc = new AutoCompleteStringCollection();
acsc.Add("Jane Doe"); // value from API perhaps?
acsc.Add("John Smith"); // value from API query all

当用户让texbox帮他们写好名字后，可以将名字提交给API加载其余的用户信息

一个组合可以提前工作；下载所有数据，选择其中的一些显示在组合中，其余的保留在后面的代码中访问..

JSON 用组合框替换文本框时遇到错误

JSON error encountered when replacing a text box with a Combo Box

c#

json

windows-forms-designer

winforms