使用Ajax中的Get方法将参数获取到控制器中

Question

我在cshtml文件中有这段代码

@using (Html.BeginForm("UserPermission", "UserPermision", new { area = "Admin", id = "cbbDpm", name = "cbbDpm" }, FormMethod.Post))
{
@Html.DropDownListFor(m => m.Dept, new SelectList(Model.Dept, "DepartmentName", "DepartmentName"), "-- Select Department --", new { @class = "form-control w-100", @id = "cbbDpmt", @name = "cbbDpmt" })
}
...
<div id="partialDiv">
@Html.Partial("_Table")
</div>
...
<script>
$(document).ready(function () {
$("#cbbDpmt").on("change", function () {
$.ajax(
{
url: '/Admin/UserPermision/CBBSelectedChange?dpmname' + $(this).val(),
type: 'GET',
data: "",
contentType: 'application/json; charset=utf-8',
success: function (data) {
$("#partialDiv").html(data);
},
error: function () {
alert("error");
}
});
});
});
</script>

在控制器中，我有：

[HttpGet]
public PartialViewResult CBBSelectedChange(string dpmname)
{
List<AdminUserPermission> userModels = DatabaseServer.ConvertDataTable<AdminUserPermission>(DatabaseServer.Read_Table(@"SELECT * 
FROM dbo.tblWFX_UserGroup AS gr 
JOIN dbo.tblWFX_Department AS dpm ON gr.DepartmentName = dpm.DepartmentID 
WHERE dpm.DepartmentName = " + dpmname, false));
Session["selectedDept"] = dpmname;
AdminUserPermissionParty adminUserPermissionParties = new AdminUserPermissionParty();
adminUserPermissionParties.UserPermisionModel = userModels;
return PartialView("_Table", adminUserPermissionParties);
}

我想把从cshtml中的组合框中选择的项目放到控制器中的函数中。我试着研究了很多次，但我无法将cbb中的选定值放入字符串dpmname中。请帮帮我。

Answer 1

您需要使用[FromUri]

[HttpGet]
public PartialViewResult CBBSelectedChange([FromUri] string dpmname)

并更改Ajax调用如下：

$.ajax(
{
url: '/Admin/UserPermision/CBBSelectedChange?dpmname=' + $(this).val(),
type: 'GET',
contentType: 'application/json; charset=utf-8',
success: function (data) {
$("#partialDiv").html(data);
},
error: function () {
alert("error");
}
});

请参阅：https://learn.microsoft.com/en-us/aspnet/web-api/overview/formats-and-model-binding/parameter-binding-in-aspnet-web-api