查看如何编写弹出消息"No records“

Question

当搜索结果为零时，我在我的软件中编写了一个搜索函数。它不会给我任何弹出窗口或任何消息。如何处理这种情况我的代码如下所示。

我需要任何消息被弹出，当它没有显示我的表中的数据时。

      `private void cncInfoBindingNavigatorSaveItem_Click(object sender, EventArgs e)
         {
        this.Validate();
        this.cncInfoBindingSource.EndEdit();
        this.tableAdapterManager.UpdateAll(this.cncDataSet1);

       }

    private void Form1_Load(object sender, EventArgs e)
    {
        // TODO: This line of code loads data into the 'cncDataSet1.CncInfo' table. You can move, or remove it, as needed.
        this.cncInfoTableAdapter.Fill(this.cncDataSet1.CncInfo);
        timer1.Start();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        this.cncInfoBindingSource.AddNew();
    }

    private void button2_Click(object sender, EventArgs e)
    {
        this.Validate();
        this.cncInfoBindingSource.EndEdit();
        this.tableAdapterManager.UpdateAll(this.cncDataSet1);
    }

    private void button3_Click(object sender, EventArgs e)
    {
        this.cncInfoBindingSource.RemoveCurrent();
    }
    int count = 0;
    private void timer1_Tick(object sender, EventArgs e)
    {

            count = cncInfoBindingSource.Count;
            label_status.Text = "Records Found: " + count.ToString();
            if (count < 2)
            {
                Next_btn.Visible = false;
                Previous_btn.Visible = false;
            }
            else if (count <= 0)
            {
                MessageBox.Show("No records found ");
            }
            else
            {
                Next_btn.Visible = true;
                Previous_btn.Visible = true;
            }

    }

    private void Next_btn_Click(object sender, EventArgs e)
    {
        cncInfoBindingSource.MoveNext();
    }

    private void Previous_btn_Click(object sender, EventArgs e)
    {
        cncInfoBindingSource.MovePrevious();
    }
    private void button4_Click(object sender, EventArgs e)
    {
        this.cncInfoTableAdapter.SearchFileName(this.cncDataSet1.CncInfo, textBox1.Text);
    }
    private void textBox1_TextChanged(object sender, EventArgs e)
    {

    }

    private void button5_Click(object sender, EventArgs e)
    {

        this.cncInfoTableAdapter.SearchFileName(this.cncDataSet1.CncInfo, textBox1.Text);

    }
            }
          }
           `

Answer 1

在计时器上显示消息框是相当丑陋的。

但是，对于您请求帮助的问题：

你的代码是: if (count < 2) { /hide <= /} else if (count Message 0) {/show message/}

消息框永远不会显示，因为0<2并且代码只是隐藏了按钮。

Answer 2

尝试：

if(cncInfoTableAdapter.GetData().Rows.Count < 1) MessageBox.Show("whatever");