ASP.NET Core MVC - Data does not pass from the view to the controller in a post request-CodePudding

I tried following this similar question: How to update multiple rows at once from a View (ASP.NET - Core) Everything is almost structurally similar but the data from the view still could not go to the controller.

Here is the view model:

public class ManageUsersViewModel
{
       public Guid? ProjectId;
       public List<ProjectUserRowModel> ProjectUserRows;
       public List<ProjectRole> ProjectRoles;
}

public class ProjectUserRowModel
{
       public Guid Guid { get; set; }
       public string Name { get; set; }
       public string Email { get; set; }
       public Guid RoleId { get; set; }
}

Here is the view (Just the form/table for brevity):

<div >
    <div >
        <form asp-action="ManageUsersSave" method="post">
            <div asp-validation-summary="ModelOnly" ></div>
            <input type="hidden" asp-for="ProjectId"/>
            <table>
                @for (var i=0; i < Model.ProjectUserRows.Count(); i  )
                {
                    <tr>
                        <input type="hidden" asp-for="@Model.ProjectUserRows[i].Guid" />
                        <td>
                            <input type="hidden" asp-for="@Model.ProjectUserRows[i].Name" />
                            @Model.ProjectUserRows[i].Name
                        </td>
                        <td>
                            <input type="hidden" asp-for="@Model.ProjectUserRows[i].Email" />
                            @Model.ProjectUserRows[i].Email
                        </td>
                        <td>
                            <select asp-for="@Model.ProjectUserRows[i].RoleId" asp-items="@(new SelectList(Model.ProjectRoles, "ProjectRoleId", "Name", @Model.ProjectUserRows[i].RoleId))">
                                <option value="">-- Project Role</option>
                            </select>
                        </td>
                        <td>
                            <a asp-action="DeleteProjectUser" asp-route-id="@Model.ProjectUserRows[i].Guid" >Delete</a>
                        </td>
                    </tr>
                }
            </table>
            <div >
                <input type="submit" value="Save" />
            </div>
        </form>
    </div>
</div>

And this is the declaration of the method:

[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> ManageUsersSave([Bind("ProjectId,ProjectUserRows,ProjectRoles")]ManageUsersViewModel manageUsersViewModel)

I could not find any errors at all except that the values when processing the object, the values are null.

CodePudding user response：

I notice you are using fields, not properties in the ManageUsersViewModel model.
The model binder only works for properties.

Also a note on the [Bind] attribute. I'm not very familiar with it, whether it recognizes form data or not. If it doesn't work, use the [FromForm].

CodePudding user response：

What happens if you specify FromBody instead of Bind?

[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> ManageUsersSave([FromBody]ManageUsersViewModel manageUsersViewModel)