这对我来说很管用:

dataSource = new MatTableDataSource<Dict>([]);
    public search() {
        let url = `${Constants.API.COMMON}/dicts?page=${this.page.number}&` + 
        (this.name == '' ? '' : `name_like=${this.name}`);
    this._http.get<Dict>(url).subscribe((data)=> {
    // this.dataSource = data['_embedded'].dicts;
    this.dataSource.data =  data['_embedded'].dicts;
    this.page = data['page'];
    this.resetSelection();
  });
}

所以你应该声明你的数据源实例为MatTableDataSource

在阅读材料表未更新后，数据更新#11638错误报告 我发现最好的(读，最简单的解决方案)是最后的评论者“shhdharmen”建议使用EventEmitter。

这涉及到对生成的数据源类进行一些简单的更改

例如，在你的数据源类中添加一个新的私有变量

import { EventEmitter } from '@angular/core';
...
private tableDataUpdated = new EventEmitter<any>();

当我将新数据推入内部数组(this.data)时，我会触发一个事件。

public addRow(row:myRowInterface) {
    this.data.push(row);
    this.tableDataUpdated.emit();
}

最后，更改'connect'方法中的'dataMutation'数组，如下所示

const dataMutations = [
    this.tableDataUpdated,
    this.paginator.page,
    this.sort.sortChange
];

在refresh()方法中使用ChangeDetectorRef触发变更检测 在接收到新数据后，在构造函数中注入ChangeDetectorRef，并像这样使用detectChanges:

import { Component, OnInit, ChangeDetectorRef } from '@angular/core';
import { LanguageModel, LANGUAGE_DATA } from '../../../../models/language.model';
import { LanguageAddComponent } from './language-add/language-add.component';
import { AuthService } from '../../../../services/auth.service';
import { LanguageDataSource } from './language-data-source';
import { LevelbarComponent } from '../../../../directives/levelbar/levelbar.component';
import { DataSource } from '@angular/cdk/collections';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/of';
import { MatSnackBar, MatDialog } from '@angular/material';

@Component({
  selector: 'app-language',
  templateUrl: './language.component.html',
  styleUrls: ['./language.component.scss']
})
export class LanguageComponent implements OnInit {
  displayedColumns = ['name', 'native', 'code', 'level'];
  teachDS: any;

  user: any;

  constructor(private authService: AuthService, private dialog: MatDialog,
              private changeDetectorRefs: ChangeDetectorRef) { }

  ngOnInit() {
    this.refresh();
  }

  add() {
    this.dialog.open(LanguageAddComponent, {
      data: { user: this.user },
    }).afterClosed().subscribe(result => {
      this.refresh();
    });
  }

  refresh() {
    this.authService.getAuthenticatedUser().subscribe((res) => {
      this.user = res;
      this.teachDS = new LanguageDataSource(this.user.profile.languages.teach);
      this.changeDetectorRefs.detectChanges();
    });
  }
}

好吧，我遇到了一个类似的问题，我向数据源添加了一些东西，但它没有重新加载。

我发现最简单的方法就是重新分配数据

let dataSource = ['a','b','c']
dataSource.push('d')
let cloned = dataSource.slice()
// OR IN ES6 // let cloned = [...dataSource]
dataSource = cloned

在添加一个新的数据行之后，我通过更新dataSource而不使用它的实例刷新了材料表。

HTML格式的表格:

<table mat-table #table [dataSource]="myDataArray">

component.ts中的addUser():

public USER_DATA: user[] = [];


public newUser = {userName: "ABC", email: "abc@gmail.com"};
public myDataArray: any;


addUser() {
    const newUsersArray = this.USER_DATA;
    newUsersArray.push(this.newUser);
    this.myDataArray = [...newUsersArray];//refresh the dataSource
    
  }

在我的例子中(Angular 6+)，我继承了MatTableDataSource来创建MyDataSource。事后都不打电话。data = someArray

this.entitiesSubject.next(this.data as T[])

未显示的数据

类的一个

export class MyDataSource<T extends WhateverYouWant> extends MatTableDataSource<T> {

    private entitiesSubject = new BehaviorSubject<T[]>([]);


    loadDataSourceData(someArray: T[]){
        this.data = someArray //whenever it comes from an API asyncronously or not
        this.entitiesSubject.next(this.data as T[])// Otherwise data not displayed
    }

    public connect(): BehaviorSubject<T[]> {
        return this.entitiesSubject
    }

}//end Class