blazor

Blazor: A second operation started on this context before a previous operation completed

由 可紊 提交于 2019-12-29 08:23:04
问题 I'm creating a server side Blazor app. The following code is in the Startup.cs . services.AddDbContext<MyContext>(o => o.UseSqlServer(Configuration.GetConnectionString("MyContext")), ServiceLifetime.Transient); services.AddTransient<MyViewModel, MyViewModel>(); And in the ViewModel: public class MyViewModel : INotifyPropertyChanged { public MyViewModel(MyContext referenceContext) { _myContext = myContext; } public async Task<IEnumerable<Dto>> GetList(string s) { return await _myContext.Table1

Is it possible to get a list of RenderFragments when overriding BuildRenderTree?

由 人走茶凉 提交于 2019-12-25 01:24:49
问题 I'm wondering if it's possible to reference child elements in the ChildContent parameter of a component. I can pass values from parent components to children explicitly or by using a cascading parameter, but there is no great way for a parent component to "know" about elements inside the ChildContent RenderFragment . A possible use-case for this would be a UIList component that gets the number of UIListItems that have been added to the UIList component during the render process. I've

Child Blazor app on Blazor Server side app

由 前提是你 提交于 2019-12-24 16:07:58
问题 Adding a Client side Blazor app to a Server Side Blazor app Hi Following on to the helpful answer here Blazor sub app 404 error after upgrade to Preview 6 I have run into a situation where it would be helpful to be able to add a Client side Blazor app to a Blazor server side app I have created the Blazor Server app, attached a client app the the server app, and adjusted the server startup.cs to map the child app. I have also confirmed the client apps index.html base value is correct app

Blazor: Access parameter from layout

由 时光毁灭记忆、已成空白 提交于 2019-12-24 15:28:54
问题 How can I access a page's route parameter from the layout? I have a page that accepts a route parameter like the following: @page /my-page/{Slug} I am needing to access the value of Slug when rendering markup in the shared layout. I have tried implementing OnParametersSet in the layout file like the following, but the value is not set. It's only assigned at the page level. @inherits LayoutComponentBase <div class="sidebar"> <NavMenu /> </div> <div class="main"> <div class="top-row px-4">

How to sign out over HttpContext in server-side Blazor

由 余生颓废 提交于 2019-12-24 11:18:22
问题 I access the HttpContext in a Blazor server-side view to manually log out. I added this line to Startup.cs: services.AddHttpContextAccessor(); and inject it in the view with @inject IHttpContextAccessor HttpContextAccessor . I've got a log out button which tries to execute this code: await HttpContextAccessor.HttpContext.SignOutAsync("Cookies"); but I get the following error message: System.InvalidOperationException: 'Headers are read-only, response has already started.' How can I prevent

Data binding in Blazor: How to propagate values out of a component?

由 笑着哭i 提交于 2019-12-24 08:18:24
问题 I have a fairly simple component, which looks like this: <form> <div class="form-group"> <label for="sampleText">Sample Text</label> <input type="text" class="form-control" id="sampleText" aria-describedby="sampleTextHelp" placeholder="Enter a text" @bind="@Value" /> <small id="sampleTextHelp" class="form-text text-muted">Enter a text to test the databinding</small> </div> </form> <p>You entered here: @Value</p> @code { [Parameter] public string Value { get; set; } } I now add this to a page

Blazor MatMenu taken last value in all menu in foreach loop

由 落爺英雄遲暮 提交于 2019-12-24 06:48:52
问题 MatMenu carrying last instance for all the listitems in foreach loop @foreach (var sub in subs) { <MatButton Label="Menu" OnClick="@OnClick" RefBack="@buttonForwardRef"></MatButton> <MatMenu @ref="Menu" TargetForwardRef="@buttonForwardRef"> <MatList SingleSelection="true"> <MatListItem>@sub.SubName</MatListItem> </MatList> </MatMenu> } Everey row want differene menu 回答1: Your issue is that you are sharing buttonForwardRef between all menus. Do you need new references for each menu: @using

How to use jQuery UI from Blazor component

由 与世无争的帅哥 提交于 2019-12-24 06:42:24
问题 I am working through some Blazor examples, and while trying to work with some JSInterop solutions, I ran into an issue with jQuery UI elements. I am not a proficient Javascript programmer, but I am proficient enough with .NET so I may be missing something simple. The first jQuery UI component I have tried to work with is the "resizable" component, found here: https://jqueryui.com/resizable/ Here is what my current code looks like: index.html: <!DOCTYPE html> <html> <head> <meta charset="utf-8

Blazor Component TwoWay Databinding

由 核能气质少年 提交于 2019-12-24 05:10:37
问题 I've made a Blazor component this way: <input bind-value-oninput="Title" /> @functions { [Parameter] string Title { get; set; } [Parameter] EventCallback<string> TitleChanged { get; set; } } Parent: @page "/fetchdata" Parent:<input bind-value-oninput="Title" /> - Child:<Comp bind-Title="Title"></Comp> @functions { string Title; } as expected editing the parent input propagate it's value to the component but not viceversa, is that by design right? I achieved two-way behaviour with this edit:

How does blazor detect authorized / notautorized

由 早过忘川 提交于 2019-12-24 00:57:59
问题 I am making a custom AuthenticationStateProvider to test in a Blazor app. I am worried that the new class won't have the same functionality as the AuthenticationStateProvider class because I'm not sure how AuthenticationStateProvider works. Below I posted my custom class. Could you please tell me if this is the accepted way of overrideing this class? public class ServerAuthenticationStateProvider : AuthenticationStateProvider { string UserId; string Password; bool IsAuthenticated = false;
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