Question

我正在使用asp.net c＃代码，以便使用sql查询和下拉列表填充Gridview。场景是：

如果dropdownlist selected value为空，则从数据库中选择all（select * from table）并填充GridView。这在Visual Studio 2008以及服务器机器中完美运行。
如果dropdownlist选择的值是一个日期（这个日期是从数据库中选择的，所以它应匹配数据库中的一个列值），然后选择* from table where date = dropdownlist.selected value。如果我使用Visual Studio 2008运行它，但是为某个值提供一个空Grid或者说错误

将char数据类型转换为datetime数据类型会导致日期时间值超出范围

//Page Load
protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        Condtion = "";
        this.BindGrid(Condtion);
    }
}


//Fill Grid View
private void BindGrid( String Condtion )
{
    string strConnString = ConfigurationManager.ConnectionStrings["ICIRDATAConnectionString1"].ConnectionString;
    using (SqlConnection con = new SqlConnection(strConnString))
    {

        String Qsql = "Select * from WeeklyReportView " + Condtion + "";

        using (SqlCommand cmd = new SqlCommand(Qsql))
        {
            using (SqlDataAdapter sda = new SqlDataAdapter())
            {
                cmd.Connection = con;
                sda.SelectCommand = cmd;
                using (DataTable dt = new DataTable())
                {
                    sda.Fill(dt);
                    GridView1.DataSource = dt;
                    GridView1.DataBind();
                }
            }
        }
    }
}
//Drop down List Selected Index Changed
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
    DateTime dt;
    if(DropDownList1.SelectedValue!="1")
    {
        dt = DateTime.ParseExact(DropDownList1.SelectedValue, "dd/MM/yyyy hh:mm:ss", new CultureInfo("en-GB"));
        Condtion1 = "wr_week='" + dt + "'";
    }
    Condtion2 = "eng_name='" + DropDownList2.SelectedValue + "'";
    if (DropDownList1.SelectedValue != "1" && DropDownList2.SelectedValue != "1")
    {
        Condtion = "Where " + Condtion1 + " and " + Condtion2;
    }
    else if (DropDownList2.SelectedValue != "1" && DropDownList1.SelectedValue == "1")
    {
        Condtion = "Where " + Condtion2;
    }
    else if (DropDownList2.SelectedValue == "1" && DropDownList1.SelectedValue != "1")
    {
        Condtion = "Where " + Condtion1;
    }
    else
    {
        Condtion = "";
    }
    this.BindGrid(Condtion);
}

任何人都可以提供帮助吗？

Answer 1

尝试此查询

select * from table where date='"+DropDownList1.SelectedItem.ToString()+"';

Answer 2

试试这种方式

     dt = DateTime.Parse(DropDownList1.SelectedValue,System.Globalization.CultureInfo.InvariantCulture); 
     string ouputDate = dt.ToUniversalTime().ToString("dd/MM/yyyy hh:mm:ss",System.Globalization.CultureInfo.InvariantCulture);
     Condtion1 = "wr_week='" + ouputDate + "'";

Answer 3

您要么传递日期，要么传递参数类型的日期时间。您不能将datetime对象放入字符串并将其发送到sql server。

更改此行：

dt = DateTime.ParseExact(DropDownList1.SelectedValue, "dd/MM/yyyy hh:mm:ss", new CultureInfo("en-GB"));
    Condtion1 = "wr_week='" + dt + "'";

要：

dt = DateTime.ParseExact(DropDownList1.SelectedValue, "dd/MM/yyyy hh:mm:ss", new CultureInfo("en-GB"));
var datestring = dt.ToString("yyyy-MM-dd HH:mm:ss");
    Condtion1 = "wr_week=convert(datetime, '"+ datestring  +"', 121)";

Answer 4

谢谢大家的贡献，我找到了解决方案，实际上我的机器上安装的SQL Server和安装在服务器机器上的SQL Server之间存在不兼容问题，问题是我的sql server有“dd” / MM / yyyy hh：mm：ss“作为日期格式，但服务器机器sql server有”yyyy-MM-dd hh：mm：ss.mmm“。再次感谢。

根据DropDownList选择的日期值填充GridView

4 个答案: