private void ClickFriend(int index) { if (index >= uiModels.Count) { label_status.Text = "这个人神秘失踪了,我找不到他的资料"; return; } UserInfoModel uiModel = uiModels[index]; if (uiModel == null) { label_status.Text = "这个人神秘失踪了,我找不到他的资料"; return; } _chatUserId = uiModel.UserId; panel_chatBox.Show(); panel_promptBox.Hide(); //MessageBox.Show(uiModel.UserId + ""); }