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值不能为空。参数名称:尝试使用Web api获取数据时的来源

我有这个问题,我整晚都在试图解决这个问题,我正在为此绞尽脑汁,抱歉,如果这很愚蠢,我是一个相对较新的程序员..

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它应该通过 Web API 从我的数据库获取一些数据,并将其显示在数据网格中(使用 blazorise 的数据网格),但它不起作用。

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代码:

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@using Newtonsoft.Json; \n@page "/email/inbox"\n<Row>\n    <Column>\n        <Card Margin="Margin.Is4.OnY">\n            <CardHeader>\n                <CardTitle>Data Grid</CardTitle>\n            </CardHeader>\n            <CardBody>\n                <CardText>Combine diferent datagrid options</CardText>\n            </CardBody>\n            <CardBody>\n                <DataGrid TItem="Fornecedor"\n                          Data="@dataModels"\n                          EditMode="DataGridEditMode.Popup"\n                          Editable="true"\n                          Sortable="true"\n                          Filterable="true"\n                          ShowPager="true"\n                          RowInserted="@OnRowInserted"\n                          RowUpdated="@OnRowUpdated"\n                          RowRemoved="@OnRowRemoved"\n                          UseInternalEditing="true"\n                          @bind-SelectedRow="@fornecedorSelecionado"\n                          Striped="true"\n                          Bordered="true"\n                          Hoverable="true"\n                          CustomFilter="@OnCustomFilter">\n                    <DataGridAggregates>\n                        <DataGridAggregate TItem="Fornecedor" Field="@nameof( Fornecedor.Email )" Aggregate="DataGridAggregateType.Count">\n                            <DisplayTemplate>\n                                @($"Total emails: {context.Value}")\n                            </DisplayTemplate>\n                        </DataGridAggregate>\n                        <DataGridAggregate TItem="Fornecedor" Field="@nameof( Fornecedor.Validado )" Aggregate="DataGridAggregateType.TrueCount" />\n                    </DataGridAggregates>\n                    <DataGridColumns>\n                        <DataGridCommandColumn TItem="Fornecedor" Width="170px">\n                            <NewCommandTemplate>\n                                <Button Color="Color.Success" Clicked="@context.Clicked">New</Button>\n                            </NewCommandTemplate>\n                            <EditCommandTemplate>\n                                <Button Color="Color.Primary" Clicked="@context.Clicked">Edit</Button>\n …
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c# asp.net-core asp.net-core-webapi blazor blazorise

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