1

我用它来选择一个复选框来选择列我如何将它转换为多复选框列表到单列我使用多种方式超过 3 天没有成功

 private void BindCheckBoxList()
    {
        DataTable dt = new DataTable();
        SqlConnection connection = new SqlConnection(GetConnectionString());
        try
        {
            connection.Open();
            string sqlStatement = "SELECT * FROM boby";
            SqlCommand sqlCmd = new SqlCommand(sqlStatement, connection);
            SqlDataAdapter sqlDa = new SqlDataAdapter(sqlCmd);

            sqlDa.Fill(dt);
            if (dt.Rows.Count > 0)
            {
                CheckBoxList1.RepeatColumns = 4; // set the number of columns in the CheckBoxList
                CheckBoxList1.DataSource = dt;
                CheckBoxList1.DataTextField = "Name"; // the items to be displayed in the list items
                CheckBoxList1.DataValueField = "Name"; // the id of the items displayed
                CheckBoxList1.DataBind();

                //Setting the Selected Items in the ChecBoxList based from the value in the database
                //to do this, lets iterate to each items in the list
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    if (!string.IsNullOrEmpty(dt.Rows[i]["IsSelected"].ToString()))
                    {
                        CheckBoxList1.Items[i].Selected = Convert.ToBoolean(dt.Rows[i]["IsSelected"]);
                    }
                }
            }

        }
        catch (System.Data.SqlClient.SqlException ex)
        {
            string msg = "Fetch Error:";
            msg += ex.Message;
            throw new Exception(msg);
        }
        finally
        { 
            connection.Close();
        }
    }

    private void Update(string name, bool isSelected)
    {
        SqlConnection connection = new SqlConnection(GetConnectionString());
        SqlCommand cmd;
        string sqlStatement = string.Empty;
        try
        {
            connection.Open();
            sqlStatement = "UPDATE handymen SET IsSelected = @IsSelected WHERE Name = @BizName";
            cmd = new SqlCommand(sqlStatement, connection);
            cmd.Parameters.AddWithValue("@Name", name);
            cmd.Parameters.AddWithValue("@IsSelected", isSelected);
            cmd.CommandType = CommandType.Text;
            cmd.ExecuteNonQuery();
        }
        catch (System.Data.SqlClient.SqlException ex)
        {
            string msg = "Insert/Update error";
            msg += ex.Message;
            throw new Exception(msg);

        }
        finally
        {
            connection.Close();
        }
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            BindCheckBoxList();
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        string str = string.Empty;

        for (int i = 0; i < CheckBoxList1.Items.Count; i++)
        {
            if (CheckBoxList1.Items[i].Selected)
            {
                str = CheckBoxList1.Items[i].Text;
                Update(str, CheckBoxList1.Items[i].Selected);
            }
        }
        //ReBind the List to retain the selected items on postbacks

        BindCheckBoxList();
    }
4

4 回答 4

2

好吧，如果你要这样做，最好的方法是将它们组合成一个按位组合，也许像这样：

int value = 0;      //or short or long, depending on the number of bits
int bitDegree = 1;  //or short or long, depending on the number of bits

for (int i = 0; i < dt.Rows.Count; i++)
{
    if (!string.IsNullOrEmpty(dt.Rows[i]["IsSelected"].ToString())
        && Convert.ToBoolean(dt.Rows[i]["IsSelected"]))
    {
        value += bitDegree;
    }

    bitDegree *= 2;
}

但是，如果可以，最好在数据库中使用多个 Bit 列，而不是组合它们。

于 2010-08-04T17:16:50.643 回答
1

就我个人而言，我不会那样做，它的设计很糟糕。我会创建另一个包含所有值的表，而不是尝试将它们全部填充到一个列中。

如果您必须将它们转换为整数并用逗号分隔它们？

例如。1,0,0,1,1 等

于 2010-08-04T17:06:42.890 回答
0

Have you considered using a bit mask? Below is an explanation using selected categories as an example (not sure if categories will work in your situation but it illustrates the concept):

Begin by assigning a single binary digit to each value-

cat1  cat2  cat3 cat4
----  ----  ---- ----
1     2     4    8

Next you will add an integer column to your main table, we will call it options. When the number is converted to binary each digit will represent whether categories 1, 2, 3 or 4 are set. Example:

5 = 0101 in binary = cat1 is set, cat2 is not set, cat3 is set, cat4 is not set

id | name         | options
---------------------------
1  | name1        | 5
2  | name2        | 2
3  | name3        | 7
4  | name4        | 6

We can now use bitwise operations against the options column to determine what options are allowed. Examples:

To get all records that have category 2 set when we don't care about the other categories, perform the following operation:

2 & options = 2

This would return records 2,3 and 4.

To get all records that have cat2 and cat3 set we would perform the following bitwise operation:

6 & options = 6

This would return records 3 and 4

To get all records that have category 1 and 3 set we would perform the following bitwise operation:

5 & options = 5

This would return records 1 and 3.

ONLY category 3 set:

4 | Options = 4

Category 3 NOT set:

4 & options = 0

This is probably a hard concept to grasp so please let me know if you have any questions. It seems to me that it might be the simplest way to accomplish what you are trying to do once you can grasp the concept.

于 2010-08-04T18:07:06.487 回答
0

尝试这个

protected void Button1_Click(object sender, EventArgs e)
{
    SqlConnection con = new SqlConnection("Data Source=ANSA-PC\\SQLEXPRESS;Initial Catalog=pms;Integrated Security=True");
    String str = "";

    for (int i = 0; i <=CheckBoxList1.Items.Count-1; i++)
    {

        if (CheckBoxList1.Items[i].Selected)
        {

            if (str == "")
            {
                str = CheckBoxList1.Items[i].Text;
            }
            else
            {
                str += "," + CheckBoxList1.Items[i].Text;

            }

        }
    }
    con.Open();
    SqlCommand cmd = new SqlCommand("insert into aa(a)values('" +str + "')", con);
    cmd.ExecuteNonQuery();
    ClientScript.RegisterStartupScript(Page.GetType(), "validation", "<script language='javascript'>alert('ansari:u also got it')</script>");
}
于 2013-03-28T17:46:56.937 回答