我正在开发 Blazor 服务器项目。要求之一是在弹出窗口中显示记录，然后将其打印为 PDF 文档。如果记录太多而无法容纳在一页上，PDF 将仅保存为单页。我的意思是只有几条记录适合显示在 PDF 的第一页上。如何让PDF显示所有记录？ 是CSS的原因吗？
这里是模态：
@page "/dialogcard/{Order}"
@using IMS.CoreBusiness
@using IMS.UseCases.Interfaces.OrderDetail
@using System.Globalization
@inject IViewOrderDetailsByOrderIdUseCase ViewOrderDetailsByOrderIdUseCase
@inject DialogService DialogService
@inject IJSRuntime JsRuntime
<style>
.rz-dialog-wrapper {
left:0;
}
/*.rz-card{
margin-top: -1.9rem !important;
}*/
.rz-dialog-content {
margin-top: -55px;
}
</style>
@if (orderDetails != null)
{
<div id="printarea1">
<div class="row my-4">
<div class="col-md-12">
<RadzenCard>
<h3 class="h5">
Order Date: @Order.OrderDateTime
</h3>
<RadzenTabs>
<Tabs>
@{
var detailVendorId = 0;
}
@foreach (var detail in orderDetails)
{
@if (detailVendorId != detail.VendorId)
{
<RadzenTabsItem Text="@detail.Vendor.Name">
<div class="row">
<div class="col-lg-6 d-flex">
<RadzenCard Style="width: 100%; overflow: hidden;">
<h3 class="h5">Contact</h3>
<div class="d-flex flex-row">
<div>
<div>Company</div>
<b>Vorlance</b>
<div class="mt-3">Responsible</div>
<b>@detail.Order.DoneBy</b>
<div class="mt-3">Vendor</div>
<b>@detail?.Vendor.Name</b>
</div>
</div>
</RadzenCard>
</div>
<div class="col-lg-6 d-flex">
<RadzenCard Style="width: 100%; overflow: hidden;">
<h3 class="h5">Delivery Information</h3>
<div class="row">
<div class="col">
<div>Company Name</div>
@switch (detail.Warehouse)
{
case "Shenzhen Warehouse":
<b>@string.Format(new CultureInfo("en-US"), "test")</b>
<div>Address</div>
<b>@string.Format(new CultureInfo("en-US"), "test")</b>
<div>Contact Name</div>
<b>@string.Format(new CultureInfo("en-US"), "test")</b>
<div>Email</div>
<b>@string.Format(new CultureInfo("en-US"), "test")</b>
<div>Phone</div>
<b>@string.Format(new CultureInfo("en-US"), "+1233455")</b>
break;
case "USA Warehouse":
<b>@string.Format(new CultureInfo("en-US"), "Company Name: TRADING LLC")</b>
<div>Address</div>
<b>@string.Format(new CultureInfo("en-US"), "1243445,Coconut Creek, FL, ZIP Code: 33073")</b>
<div>Contact Name</div>
<b>@string.Format(new CultureInfo("en-US"), "Test")</b>
<div>Email</div>
<b>@string.Format(new CultureInfo("en-US"), "[email protected]")</b>
<div>Phone</div>
<b>@string.Format(new CultureInfo("en-US"), "+123242422")</b>
break;
case "Private Shipping":
<b>@string.Format(new CultureInfo("en-US"), "ELEKTRONIK SANAYI VE TICARET LTD. STI.")</b>
<div>Address</div>
<b>@string.Format(new CultureInfo("en-US"), "test")</b>
<div>Contact Name</div>
<b>@string.Format(new CultureInfo("en-US"), "Test")</b>
<div>Email</div>
<b>@string.Format(new CultureInfo("en-US"), "[email protected]")</b>
<div>Phone</div>
<b>@string.Format(new CultureInfo("en-US"), "111122")</b>
break;
}
@* <div>Address</div>
<b>@(detail?.Warehouse)</b>
*@
</div>
</div>
</RadzenCard>
</div>
</div>
<RadzenDataGrid AllowFiltering="false" AllowPaging="false" AllowSorting="true" FilterCaseSensitivity="FilterCaseSensitivity.CaseInsensitive"
Data="@orderDetails.Where(x => x.VendorId == detail.VendorId)" TItem="OrderDetail" Class="mt-3" Style="height:190px">
<Columns>
<RadzenDataGridColumn TItem="OrderDetail" Property="OrderId" Title="Order ID" Width="100px"/>
<RadzenDataGridColumn TItem="OrderDetail" Property="Id" Title="Product ID" Width="100px"/>
<RadzenDataGridColumn TItem="OrderDetail" Property="ProductCode" Title="Product Code" Width="150px"/>
<RadzenDataGridColumn TItem="OrderDetail" Property="Currency" Title="Currency" Width="95px"/>
<RadzenDataGridColumn TItem="OrderDetail" Property="Quantity" Title="Quantity" Width="95px">
<FooterTemplate>
<b>@string.Format(new CultureInfo("tr-TR"), "{0:G}", orderDetails?.Where(x => x.VendorId == detail.VendorId).Sum(o => o.Quantity))</b>
</FooterTemplate>
</RadzenDataGridColumn>
<RadzenDataGridColumn TItem="OrderDetail" Property="BuyUnitPrice" Title="Unit Price" Width="100px">
<Template Context="detail">
@switch (detail.Currency)
{
case "USD":
@string.Format(new CultureInfo("en-US"), "{0}{1:0.#####}",new CultureInfo("en-US").NumberFormat.CurrencySymbol, detail.BuyUnitPrice)
break;
case "EURO":
@string.Format(new CultureInfo("en-FR"), "{0}{1:0.#####}",new CultureInfo("en-FR").NumberFormat.CurrencySymbol, detail.BuyUnitPrice)
break;
default:
@string.Format(new CultureInfo("tr-TR"), "{0}{1:0.#####}",new CultureInfo("tr-TR").NumberFormat.CurrencySymbol, detail.BuyUnitPrice)
break;
}
</Template>
</RadzenDataGridColumn>
<RadzenDataGridColumn TItem="OrderDetail" Property="TotalBuyPrice" Title="Total Price" Width="100px">
<Template Context="detail">
@switch (detail.Currency)
{
case "USD":
@string.Format(new CultureInfo("en-US"), "{0}{1:0.#####}",new CultureInfo("en-US").NumberFormat.CurrencySymbol, detail.TotalBuyPrice)
break;
case "EURO":
@string.Format(new CultureInfo("en-FR"), "{0}{1:0.#####}",new CultureInfo("en-FR").NumberFormat.CurrencySymbol, detail.TotalBuyPrice)
break;
default:
@string.Format(new CultureInfo("tr-TR"), "{0}{1:0.#####}",new CultureInfo("tr-TR").NumberFormat.CurrencySymbol, detail.TotalBuyPrice)
break;
}
</Template>
<FooterTemplate>
@switch (detail.Currency)
{
case "USD":
<b>@string.Format(new CultureInfo("en-US"), "{0:N2}", orderDetails?.Where(x => x.VendorId == detail.VendorId).Sum(o => o.TotalBuyPrice))</b>
break;
case "EURO":
<b>@string.Format(new CultureInfo("en-FR"), "{0:N2}", orderDetails?.Where(x => x.VendorId == detail.VendorId).Sum(o => o.TotalBuyPrice))</b>
break;
default:
<b>@string.Format(new CultureInfo("tr-TR"), "{0:N2}", orderDetails?.Where(x => x.VendorId == detail.VendorId).Sum(o => o.TotalBuyPrice))</b>
break;
}
</FooterTemplate>
</RadzenDataGridColumn>
</Columns>
</RadzenDataGrid>
</RadzenTabsItem>
}
detailVendorId = detail.VendorId;
}
</Tabs>
</RadzenTabs>
</RadzenCard>
</div>
</div>
</div>
}
<div class="row">
<div class="col-md-12 text-right">
<RadzenButton Click="@((args) => DialogService.Close(false))" ButtonStyle="ButtonStyle.Secondary" Text="Close" Style="width: 120px" Class="mr-1"/>
<RadzenButton Click="PrintDocument" Text="Print" Style="width: 120px" />
@*<button type="button" class="btn btn-primary btns" @onclick="PrintDocument">Print</button>*@
</div>
</div>
@code {
[Parameter] public ReportViewModel Order { get; set; }
IEnumerable<OrderDetail> orderDetails;
protected override async Task OnInitializedAsync()
{
orderDetails = await ViewOrderDetailsByOrderIdUseCase.ExecuteAsync(Order.OrderId);
}
private void PrintDocument()
{
JsRuntime.InvokeVoidAsync("print");
}
}
这是模式的屏幕截图：
这是打印预览：
这是相关的CSS：
@media print {
body * {
visibility: hidden;
}
#printarea1, #printarea1 *{
visibility: visible;
}
#printarea, #printarea * {
visibility: visible;
}
.rz-tabview-nav li:not(.rz-tabview-selected) {
display: none;
}
#printarea1 {
position: fixed;
left: 0;
top: 170px;
}
#printarea {
position: fixed;
left: 15px;
top: 0;
}
button[type=button], input[type=text] {
display: none;
}
.rz-data-grid {
height: unset!important;
}
}
编辑 1
我研究了一下，像这样改变了CSS，但仍然是一页:(
.rz-data-grid {
height: auto !important;
overflow: visible !important;
page-break-after: always;
} 
浏览器默认使用A4作为页面尺寸选项来打印页面，为了适应页面尺寸，浏览器打印预览会自动隐藏溢出的内容。因此，具有大量列的数据网格将被剪掉以适应打印页面的大小。
要打印大量列，请根据内容大小调整打印选项面板中的缩放选项。
当数据网格包含大量数据时，考虑到浏览器性能，一次打印所有数据并不是最佳选择。因为在单个页面中渲染所有 DOM 元素会在浏览器中产生性能问题。这会导致浏览器速度变慢或无响应。 DataGrid 可以选择通过虚拟化处理大量数据。但是，在打印时，无法对行和列使用虚拟化。
如果仍然需要打印所有数据，我们建议您将数据网格导出到 Excel 或 CSV 或 Pdf 文件，然后从另一个非基于 Web 的应用程序进行打印。
生成PDF的方法和库有很多，比如syncfusion等