Question

我的数据库就像这样。

obtain name
ask again
verify address


public class Program
{
    public static void Main()
    {
        //Console.WriteLine("Hello World");
        Program.GetReturn("started manually 23:56:22 Skipped: obtain name Completed: verify dob Skipped: ask again Skipped: verify address  Completed: verify country Stopped manually 23:58:55","Skipped:");
    }

    public static string GetReturn(string str,string word)
    {
        string mystr="";
        var myarray=str.Split(' ');

        for(int i = 0; i< myarray.Length-1; i++)
        {

            if(myarray[i]==word)
            {
                mystr=myarray[i+1] + " " +myarray[i+2];
                Console.WriteLine(String.Format("{0} {1}", myarray[i+1],myarray[i+2]));
            }
        }       

        return mystr;
    }

Vehicle Make | Vehicle Model ----------------------------- Toyota | AQUA HONDA | FIT Toyota | Prius，填充像这样。

DropDownList1

但由于我有重复的数据（2丰田＆＃39; s），它也会在DropDownList中显示它们。

是否可以过滤并且只有1个丰田？

-PS

我需要它添加我的数据库，因为可能有更多的车辆添加。

Answer 1

当然，您可以使用DISTINCT：

SqlDataAdapter adapter = new SqlDataAdapter("SELECT DISTINCT VehicleMake FROM VehicleDB", con);

您可能还想添加ORDER BY：

string sql = @"SELECT DISTINCT VehicleMake 
               FROM VehicleDB
               ORDER BY VehicleMake ASC";
using(var  adapter = new SqlDataAdapter(sql, con))
{
    // ...
}

Answer 2

首先，您可以将查询更改为＆＃34; SELECT VehicleMake FROM VehicleDB，其中VehicleMake＆lt;＆gt; ＆＃39; FIT Toyota＆＃39;＆＃34;并且更改查询不是你的选择，那么你可以做这样的事情

var subjects= ds.Tables["VehicleDB"];
adresse.DefaultView.RowFilter = "VehicleMake LIKE '%TEST%'";

DropDownList1.DataSource = subjects;
DropDownList1.DataTextField = "VehicleMake";
DropDownList1.DataValueField = "VehicleMake";
DropDownList1.DataBind();

甚至这不会工作为数据表应用LINQ - for循环

ASP.NET DropDownList数据库中的重复值

2 个答案: