Question

为什么 我不能使用datetimepicker的属性啊DateTime dateTimePicker1 = dateTimePicker1.Text; ; 显示 Text

namespace 图书管理系统
{
public partial class LendStatistics : Form
{
public LendStatistics()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
DateTime dateTimePicker1 = dateTimePicker1.Text; ;
DateTime dateTimePicker2 = dateTimePicker2.Text;

SqlConnection conn = new SqlConnection(" integrated security=True; data source=.; database=DBLibrary");
conn.Open();
string str = " select rdID as 读者证号,bkName,书名 ,bkCode as 书号,from Borrow from Books join Borrow on (Books.bkCode=Borrow.bkCode) where DateLend between dateTimePicker1 and dateTimePicker2 ";
SqlDataAdapter adapter = new SqlDataAdapter(str, conn);
DataTable tb = new DataTable();
adapter.Fill(tb);
dataGridView1.DataSource = tb;
conn.Close();

}

}
}

Answer 1

不应该使用dateTimePicker的Text属性，而是value属性

Answer 2

虽然不知道你那句DateTime dateTimePicker1 = dateTimePicker1.Text; 是想干啥...
可如果你想新建一个dateTimePicker话，要用DatePicker！！！,而不是DateTime

追问

就是我想把 dateTimePicker1.Text这个空间的值 赋给一个字符串

追答

哦...那你这么写吧...
String a = datePicker1.Text;