Flutter票务应用开发报错：List无'lenght' getter，求代码修正

错误原因 #

核心问题是拼写错误：将列表长度的属性length误写为lenght，导致Flutter无法识别该属性。

修正后的首页代码 #

body: CustomScrollView(
        slivers: [
          SliverPersistentHeader(
            pinned: true,
            delegate: TextDelegateHeaderWidget(title : "My Services"),
          ),

          StreamBuilder(
              stream: FirebaseFirestore.instance
                  .collection("sellers")
                  .doc(sharedPreferences!.getString("uid"))
                  .collection("brands")
                  .snapshots(),
              builder: (context, AsyncSnapshot dataSnapshot) {
                if(dataSnapshot.hasData) {
                  return SliverStaggeredGrid.countBuilder(
                    crossAxisCount: 1,
                    staggeredTileBuilder: (c)=> const StaggeredTile.fit(1),
                    itemBuilder: (context, index) {
                      Brands brandsModel = Brands.fromJson(
                        dataSnapshot.data!.docs[index].data() as Map<String, dynamic>);

                      return BrandsUiDesignWidget(
                        model: brandsModel,
                        context: context,
                      );
                    },
                    // 修正拼写错误：lenght → length
                    itemCount: dataSnapshot.data.docs.length,
                  );
                } else {
                  return const SliverToBoxAdapter(
                    child: Center(
                      child: Text(
                        "No Services Exists. Please Add Some",
                      ),
                    ),
                  );
                }
              }
           )
        ],
      ),

Brands类代码说明 #

你提供的_BrandsUiDesignWidgetState代码无问题，无需修改。

内容的提问来源于stack exchange，提问作者Safi Ullah