C＃-DataGridView和DateTimePicker的问题

Question

我需要帮助来理解我错了，我正在使用DataGridView允许在Form中显示表格，并且我想插入具有两个DateTimePicker字段的选择日期范围的功能，然后启动SELECT但是，当我启动程序并尝试在DataGridView字段中进行选择时，即使我设置了两个SelectCommand指令，也要用“ CERCA”按钮声明。我不明白我哪里错了。

    public DataGridView_Maria()
    {
        InitializeComponent();
    }
    SqlConnection conn = new SqlConnection("Data Source=192.168.0.51;Initial 
    Catalog=Archivio_Stipendi;User ID=sa;Password=NI2000ma;");

    private void CERCA_Button_Click(object sender, EventArgs e)
    {
        conn.Open();
        'SqlDataAdapter sdf = new SqlDataAdapter(@"SELECT GIORNO, RIPOSO, ORE_LAVORO, COMPENSO_LAVORO FROM [dbo].[MARIA_VARAVALLO] WHERE GIORNO BETWEEN '@DA_GIORNO' AND '@A_GIORNO';", conn);'

        sdf.SelectCommand.Parameters.AddWithValue("@DA_GIORNO", Da_Mar_DTP.Text);
        sdf.SelectCommand.Parameters.AddWithValue("@A_GIORNO", A_Mar_DTP.Text);

        DataTable sd = new DataTable();
        sdf.Fill(sd);
        DataGridView_Mar.DataSource = sd;

        conn.Close();
    }
}

我只是根据您的建议进行了更改，通过直接从查询中设置日期范围，DataGridView可以正常工作，单击“ CERCA”按钮将显示设置的日期。太棒了！但是我仍然不知道为什么DataTimePicker给他带来了问题...

这是修改后的代码：

    public DataGridView_Maria()
    {
        InitializeComponent();
    }
    SqlConnection conn = new SqlConnection("Data Source=192.168.0.51;Initial Catalog=Archivio_Stipendi;User ID=sa;Password=NI2000ma;");
    private void CERCA_Button_Click(object sender, EventArgs e)
    {
        conn.Open();
        SqlDataAdapter sdf = new SqlDataAdapter(@"SELECT GIORNO, RIPOSO, ORE_LAVORO, COMPENSO_LAVORO FROM [dbo].[MARIA_VARAVALLO] WHERE GIORNO BETWEEN 'Lunedì 09 Marzo 2020' AND 'Lunedì 09 Marzo 2020';", conn);
        DataTable sd = new DataTable();
        sdf.Fill(sd);
        DataGridView_Mar.DataSource = sd;

        conn.Close();
    }
}

}

Answer 1

代替Text的DateTimePicker属性，尝试使用Value属性，如下所示：