flutter - snapshotData.docs[index].data()['firstName'] 出现错误

Question

• 我正在尝试Searchbar为我的应用程序实现，它将根据用户的firstName.
• 我面临以下错误说

The method '[]' can't be unconditionally invoked because the receiver can be 'null'.
Try making the call conditional (using '?.') or adding a null check to the target ('!').

• 代码

late QuerySnapshot snapshotData;
..
..
title: Text(snapshotData.docs[index].data()['firstName'], style: TextStyle(
            color: Colors.white,
            fontWeight: FontWeight.bold,
            fontSize: 24.0
          ),
          ),

标签： fluttergoogle-cloud-firestore

Answer 1

利用

Text(snapshotData.docs[index].get('firstName'))