windows phone 之ListBox模板选择

有时做项目时，会遇到一种情况：需要把获取到的数据集合显示到首页，比如新闻，但是：

新闻也分类别啊，比如：图片类新闻、文字类新闻、视频类新闻。

那我们可能采用的模板就不一样了，那么，如何根据类别来选择模板呢？

（1）首先，创建一个类DataTemplateSelector并继承ContentControl。

 public class DataTemplateSelector : ContentControl
    {
        public virtual DataTemplate SelectTemplate(object item, DependencyObject container)
        {
            return null;
        }

        protected override void OnContentChanged(object oldContent, object newContent)
        {
            base.OnContentChanged(oldContent, newContent);

            ContentTemplate = SelectTemplate(newContent, this);
        }
    }

（2）创建类ListDataTemplateSelector并继承DataTemplateSelector

public  class ListDataTemplateSelector : DataTemplateSelector
    {
        public DataTemplate SHARE_VIDEO { get; set; }
        public DataTemplate UPDATE_STATUS { get; set; }
        public DataTemplate PUBLISH_BLOG { get; set; }
        public DataTemplate PUBLISH_ONE_PHOTO { get; set; }
        public DataTemplate SHARE_PHOTO { get; set; }
        public DataTemplate SHARE_ALBUM { get; set; }
        public DataTemplate PUBLISH_MORE_PHOTO { get; set; }
        public DataTemplate SHARE_LINK { get; set; }
        public DataTemplate SHARE_BLOG { get; set; }

        public override DataTemplate SelectTemplate(object item, DependencyObject container)
        {
            feed feed = item as feed;
            switch (feed.type)
            {
                case "SHARE_VIDEO":
                    return SHARE_VIDEO;
                case "UPDATE_STATUS":
                    return UPDATE_STATUS;
                case "PUBLISH_BLOG":
                    return PUBLISH_BLOG;
                case "PUBLISH_ONE_PHOTO":
                    return PUBLISH_ONE_PHOTO;
                case "SHARE_PHOTO":
                    return SHARE_PHOTO;
                case "SHARE_ALBUM":
                    return SHARE_ALBUM;
                case"PUBLISH_MORE_PHOTO":
                    return PUBLISH_MORE_PHOTO;
                case "SHARE_LINK":
                    return SHARE_LINK;
                case "SHARE_BLOG":
                    return SHARE_BLOG;
            }
            return base.SelectTemplate(item, container);
        }
    }

（3）如果需要，添加该类的命名空间，即可在ListBox中使用：

　　　　　　　　　　 <ListBox   ItemsSource="{Binding FeedList}"  >
                        <ListBox.ItemTemplate>
                            <DataTemplate>
                                <local:ListDataTemplateSelector Content="{Binding}">
                                    <!--1、分享视频-->
                                    <local:ListDataTemplateSelector.SHARE_VIDEO>
                                        <DataTemplate>
                                            <Grid>
                                            </Grid>
                                        </DataTemplate>
                                    </local:ListDataTemplateSelector.SHARE_VIDEO>
                                    <!--2、更新状态-->
                                    <local:ListDataTemplateSelector.UPDATE_STATUS>
                                        <DataTemplate>
                                            <Grid>
                                            </Grid>
                                        </DataTemplate>
                                    </local:ListDataTemplateSelector.UPDATE_STATUS>
                                    <!--3、发布日志-->
                                    <local:ListDataTemplateSelector.PUBLISH_BLOG>
                                        <DataTemplate>
                                            <Grid Margin="0,20,0,0">
                                            </Grid>
                                        </DataTemplate>
                                    </local:ListDataTemplateSelector.PUBLISH_BLOG>
                                    <!--4、上传一张照片-->
                                    <local:ListDataTemplateSelector.PUBLISH_ONE_PHOTO>
                                        <DataTemplate>
                                            <Grid Margin="0,20,0,0" >
                                            </Grid>
                                        </DataTemplate>
                                    </local:ListDataTemplateSelector.PUBLISH_ONE_PHOTO>
                                    <!--5、分享照片-->
                                    <local:ListDataTemplateSelector.SHARE_PHOTO>
                                        <DataTemplate>
                                            <Grid Margin="0,20,0,0" >
                                            </Grid>
                                        </DataTemplate>
                                    </local:ListDataTemplateSelector.SHARE_PHOTO>
                                    <!--6、分享相册-->
                                    <local:ListDataTemplateSelector.SHARE_ALBUM>
                                        <DataTemplate>
                                            <Grid Margin="0,20,0,0" >
                                            </Grid>
                                        </DataTemplate>
                                    </local:ListDataTemplateSelector.SHARE_ALBUM>
                                    <!--7、上传多张照片-->
                                    <local:ListDataTemplateSelector.PUBLISH_MORE_PHOTO>
                                        <DataTemplate>
                                            <Grid Margin="0,20,0,0" >
                                            </Grid>
                                        </DataTemplate>
                                    </local:ListDataTemplateSelector.PUBLISH_MORE_PHOTO>
                                    <!--8、分享链接-->
                                    <local:ListDataTemplateSelector.SHARE_LINK>
                                        <DataTemplate>
                                            <Grid>
                                            </Grid>
                                        </DataTemplate>
                                    </local:ListDataTemplateSelector.SHARE_LINK>
                                    <!--9、分享日志-->
                                    <local:ListDataTemplateSelector.SHARE_BLOG>
                                        <DataTemplate>
                                            <Grid>
                                            </Grid>
                                        </DataTemplate>
                                    </local:ListDataTemplateSelector.SHARE_BLOG>
                                </local:ListDataTemplateSelector>
                            </DataTemplate>
                        </ListBox.ItemTemplate>

                    </ListBox>

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