如何在blazor中使用select2组件？

如何解决如何在blazor中使用select2组件？

您好社区，我试图在blazor中使用select2组件，我从github上举了一个例子，但事实是我迷失了如何用数据库中的记录填充该组件

这是剃须刀页面，这是组件：

<span>Simple string example</span>
<Select2 TItem="string"
         Id="simple-string-example"
         Data="@SimpleStringList"
         @bind-Value="@ValueSelected">
</Select2>
<span>Currently selected value: @ValueSelected</span>
<br />

@code {

    private EditContext EditContext { get; set; }
    private Select2<SomeInnerObject> ProvidedSelect2Ref { get; set; }
    public SomeObject FakeObject { get; set; } = new SomeObject { SomeName = "Name" };
    private List<string> SimpleStringList { get; set; } = new List<string>();
    private List<SomeInnerObject> InnerObjectList { get; set; }
    private string ValueSelected { get; set; }

    private SomeInnerObject FooObject = new SomeInnerObject { InnerName = "Inner Foo" };

    protected override void OnAfterRender(bool firstRender)
    {
        base.OnAfterRender(firstRender);
        if (firstRender)
        {
            SimpleStringList.Add("Foo");
            SimpleStringList.Add("Bar");
            SimpleStringList.Add("Baz");

            InnerObjectList = new List<SomeInnerObject> { FooObject,new SomeInnerObject { InnerName = "Inner bar" } };
            for (var i = 0; i < 100; i++)
                InnerObjectList.Add(new SomeInnerObject { InnerName = $"Inner bar{i}" });
            EditContext = new EditContext(FakeObject).AddDataAnnotationsValidation();
            StateHasChanged();
        }
    }   
}

如何用数据库中的记录填充组件，在控制器中调用api，如下所示：

private async Task<IEnumerable<Persona>> BuscarPersonas(string searchText)
    {
        var responseHttp = await repositorio.Get<List<Persona>>($"api/Personas/buscar/{searchText}");
        return responseHttp.Response;
    }
}

解决方法

结果测试

以下是Blazor（客户端）和WebAPI（服务器）的示例。

客户端（Blazor）

1。将List<Persona>绑定到Select2并从PersonaService获取数据。

Index.razor

的代码

@page "/"
@using System.Linq
@using Demo.WebAssembly.Models
@using Demo.WebAssembly.Data


@inject PersonaService service

<span>Simple string example</span>
<Select2 TItem="Persona"
         Id="simple-string-example"
         Data="@personas"
         TextExpression="@(item => item.Name)"
         @bind-Value="@ValueSelected">
</Select2>

<span>Currently selected Inner value: @(ValueSelected?.Name)</span>


<br />

@code
{ 

    private Persona ValueSelected { get; set; } = new Persona { Name = "Name" };

    private List<Persona> personas { get; set; }

    protected override async Task OnInitializedAsync()
    {
        var personaList = await service.BuscarPersonas("user");

        personas = personaList.ToList();

    }


    protected override void OnAfterRender(bool firstRender)
    {
        base.OnAfterRender(firstRender);
        if (firstRender)
        {

            StateHasChanged();
        }
    }
}

2。从url请求数据（“ https：// localhost：44307 / api / Personas / buscar / {searchText}”）

PersonaService

的代码

public class PersonaService
{

    public async Task<IEnumerable<Persona>> BuscarPersonas(string searchText)
    {
        HttpClient httpClient = new HttpClient();
        var response = await httpClient.GetAsync("https://localhost:44307/api/Personas/buscar/" + searchText);
        if (response.IsSuccessStatusCode)
        {
            var result = await JsonSerializer.DeserializeAsync<Persona[]>(await response.Content.ReadAsStreamAsync(),new JsonSerializerOptions() { PropertyNameCaseInsensitive = true });
            return result;
        }
        else
        {
            return null; //handle the response that was not successful here.
        }
    }

}

服务器端（WebAPI）

1。接收并处理该请求。以json格式返回数据。

Controller

的代码

    [HttpGet]
    [Route("/api/Personas/buscar/{searchText}")]
    public async Task<JsonResult> GetPersona(string searchText)
    {
        var personas = _repository.getPersona(searchText);

        return new JsonResult(personas);
    }

2。从数据库中检索数据。

Repository的代码

    public List<Persona> getPersona(string searchText)
    {
        var personas = _context.Personas.Where(p=>p.Name.Contains(searchText)).ToList(); 

        return personas;
    }

注意：如果像上面的示例一样从其他域（h​​ttps：// localhost：44379）访问数据，请不要忘记启用CORS。

链接：Create a web API with ASP.NET Core