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“Get User”按钮时，该程序将从API中检索其签名（例如，如果输入员工姓名Jane Doe，则将从API字符串中检索签名“JNDO”）。

当使用文本框输入名称时，将成功读取所需信息。但是，当我将文本框替换为组合框以在用户键入时建议名称时，我会收到以下错误:

jsonReaderException:“解析值时遇到意外字符:<.路径''，行0，位置0.'此异常最初是在以下调用堆栈引发的:Webapi.cs Timesheets_Try_11.Controllers.Webapi.GetSignature（string）中的[External Code]Timesheets_Try_11.Form1.Button1_Click（object，System.EventArgs)中的Form1.cs[External Code]Timesheets_Try_11.Program.Main()中的Program.cs

通过使用断点来理解值，它声明

字符串不是JSON格式；

我的JSON字符串:

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

我的windows窗体的代码:

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JSON的代码

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;

        }
}

在JSON中定义变量的代码:

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; }
    }
   
}