我认为它向端点发送请求，并使用js代码将选项与响应数据绑定
在我看来，我尝试了以下方法：

@{   
    var select = new List<SelectListItem>() { new SelectListItem() { Text = "SelectOne" } };
}

@Html.DropDownList("MyDropDown",select)

<script>
    var httpRequest = new XMLHttpRequest()
    httpRequest.open('GET', 'https://localhost:44309/Home/GetEntity', true);
    httpRequest.send();
    httpRequest.onreadystatechange = function () {
        if (httpRequest.readyState == 4 && httpRequest.status == 200) {
            var json = httpRequest.responseText;
            var arr = JSON.parse(json);
            console.log(arr)
            for (var i = 0; i < arr.length; i++)
            {
                var drop = document.getElementById("MyDropDown")                
                var op = document.createElement("option");
                op.value = arr[i].id;
                op.innerHTML=arr[i].name
                drop.appendChild(op)
            } 
        }
    }
</script>

终点/实体：

public IActionResult GetEntity()
        {
            var someentity = new List<SomeEntity>() { new SomeEntity() { Id = 1, Name = "Name1" }, new SomeEntity() { Id = 2, Name = "Name2" } };
            return Ok(someentity);
        }

型
结果是：