DateTime默认值ASP.net core

Question

对于学生项目，我想在日期字段（ReleaseDate）中添加默认值，但仍然有日历和选择日期的选项。

我在 Models/Post.cs 中的代码：

[Display(Name = "Release Date")]
[DataType(DataType.Date)]
[DisplayFormat(ApplyFormatInEditMode =true, DataFormatString = "{0: yyyy-MM-dd}")]

public System.DateTime ReleaseDate { get; set; }

在 View/Posts/Create.cshtml 中：

<div class="form-group">
    <label asp-for="ReleaseDate" class="control-label"></label>
    <input asp-for="ReleaseDate" class="form-control" />
    <span asp-validation-for="ReleaseDate" class="text-danger"></span>
</div>

我尝试 timur 但 Controllers/PostController.cs

只能看到索引的一个定义：

 public async Task<IActionResult> Index()
        {
            return View(await _context.Movie.ToListAsync());
        }

还有你的代码：

public IActionResult Index()
{
    var model = new Post()
    {
        ReleaseDate = DateTime.Today
    };

    return View("View", model);
}

我尝试这样写 但是有一个错误（在 https://localhost:numbers/Posts

视图/帖子/Create.cshtml

@model Portal.Models.Post

@{
    ViewData["Title"] = "Create -";
}


<h1>Create</h1>

<h4>Post</h4>
<hr />
<div class="row">
    <div class="col-md-4">
        <form asp-action="Create">
            <div asp-validation-summary="ModelOnly" class="text-danger"></div>
            <div class="form-group">
                <label asp-for="Title" class="control-label"></label>
                <input asp-for="Title" class="form-control" />
                <span asp-validation-for="Title" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="ReleaseDate" class="control-label"></label>
                <input asp-for="ReleaseDate" class="form-control" />
                <span asp-validation-for="ReleaseDate" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="Description" class="control-label"></label>
                <input asp-for="Description" class="form-control" />
                <span asp-validation-for="Description" class="text-danger"></span>
            </div>
            <div class="form-group">
                <input type="submit" value="Create" class="btn btn-primary" />
            </div>
        </form>
    </div>
</div>

<div>
    <a asp-action="Index">Back to List</a>
</div>

@section Scripts {
    @{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
}

和 Views/Posts/Index.cshtml

@model IEnumerable<Portal.Models.Post>

@{
    ViewData["Title"] = "Job Rice -";
}

<!-- Image -->
<section>
    <div class="container">
        <div class="full-width-image">
            <img src="img/background.jpg" alt="">
        </div>
    </div>
</section>





<div class="text-center">
<h1><a asp-action="Create">Create new offer</a></h1>
    </div>


        @foreach (var item in Model)
        {
<section>
    <div class="container">
        <!-- Heading -->
        <div class="my-5"> </div>
        <!-- Grid row -->
        <div class="row">
            <!-- Grid column -->
            <div class="col-sm-12 sm-12">
                <!-- Card -->
                <div class="card">
                    <div class="card-header text-center colores">
                        <h4> <i class="fas fa-poll-h"></i> <a asp-action="Details" asp-route-id="@item.Id"> @Html.DisplayFor(modelItem => item.Title) </a></h4>
                    </div>
                    <!-- Card content -->
                    <form class="card-body">
                        <div class="row">
                            <div class="col-sm-12">
                                <div class="text-center"> @Html.DisplayFor(modelItem => item.Description)</div>
                                <div class="float-right"> @Html.DisplayFor(modelItem => item.ReleaseDate)</div>
                            </div>
                            <div>
                                <a asp-action="Edit" asp-route-id="@item.Id">Edit</a> 
                                <a asp-action="Delete" asp-route-id="@item.Id">Delete</a>
                            </div>
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>
</section>
}

Answer 1

正如 Tieson T. 在他的评论中指出的那样，您必须将“value”属性添加到 razor 页面中的“input”标签中：

<input asp-for="ReleaseDate" class="form-control" value="@DateTime.Today.ToString("yyyy-MM-dd")" />

当然，您可以将“DateTime.Today”替换为其他内容。

您的浏览器以不同的格式显示日期并不重要，您必须在 value 属性中使用此格式。我刚刚在 ASP.NET Core 3.1 Razor 应用程序中测试了它，它可以工作。