这个问题可能是由于jQuery版本的更改导致的，可以通过使用新的jQuery版本来解决这个问题。以下是一个解决办法：

1.在项目中安装最新版本的jquery：

Install-Package jQuery -Version 3.4.1

2.然后在Startup.cs文件中将jQuery添加到RequestLocalizationOptions中：

services.Configure(options =>
{
    options.DefaultRequestCulture = new RequestCulture("en-US");
    options.SupportedCultures = new[] { new CultureInfo("en-US") };
    options.RequestCultureProviders.Insert(0, new JQueryRequestCultureProvider());
});

3.创建一个JQueryRequestCultureProvider：

public class JQueryRequestCultureProvider : RequestCultureProvider
{
    private static readonly char[] _cookieSeparator = new[] { '|' };

    public override async Task DetermineProviderCultureResult(HttpContext httpContext)
    {
        if (httpContext == null)
        {
            throw new ArgumentNullException(nameof(httpContext));
        }

        string culture = null;
        string uiCulture = null;

        // One or two cookies with the format c=...
        var cookies = httpContext.Request.Cookies;
        if (cookies != null)
        {
            string cookieValue;
            if (cookies.TryGetValue(CookieRequestCultureProvider.DefaultCookieName, out cookieValue))
            {
                var cookieValues = cookieValue.Split(_cookieSeparator, StringSplitOptions.RemoveEmptyEntries);
                if (cookieValues.Length == 2)
                {
                    culture = cookieValues[0];
                    uiCulture = cookieValues[1];
                }
            }
        }

        // Query string values override cookies
        var qs = httpContext.Request.Query;
        if (qs != null)
        {
            if (!string.IsNullOrWhiteSpace(qs["culture"]))
            {
                culture = qs["culture"];
            }
            if (!string.IsNullOrWhiteSpace(qs["ui-culture"]))
            {
                uiCulture = qs["ui-culture"];
            }
        }

        if (culture == null && uiCulture == null)
        {
            // Use default culture if it matches a supported culture
            string[] testCultures = { "en-US" };
            var requestCulture = httpContext.Features.Get();
            if (requestCulture != null && requestCulture.RequestCulture != null)
            {
                foreach (var testCulture in testCultures)
                {
                    if (string.Equals(testCulture, requestCulture.RequestCulture.Culture.Name, StringComparison.OrdinalIgnoreCase))
                    {
                        return new ProviderCultureResult(requestCulture.RequestCulture.Culture.Name, requestCulture.RequestCulture.UICulture.Name);
                    }
                }
            }