got response good, but table shows like only lines instead of data [closed]

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I got respose.log(list) good, but in view, table shows lines only

<table mat-table [dataSource]="heroList" class="mat-elevation-z8">
<!-- Position Column 开发者_如何学C--> 
<ng-container matColumnDef="Id">
   <th mat-header-cell *matHeaderCellDef> Id. </th>
   <td mat-cell *matCellDef="let element"> {{element.Id}} </td>
</ng-container>

pls find