C# - SQL 从 CheckboxList 插入复选框的值和 ID

Question

问题：

我从 SQL table:

填充一个复选框列表

public static List<string> populateCheckBoxes(string type)
        {
            List<string> items = new List<string>();
            items.Add("");

            SqlConnection conn = new SqlConnection(connectionString);
            SqlCommand sqlcmd;
            switch (type)
            {
                case "referralorsignposting":
                    sqlcmd = new SqlCommand("SELECT * FROM SWApp_List_Equipment WHERE type = 'Referral or Signposting' ORDER BY order_no, name", conn);
                    break;
                case "actionstaken":
                    sqlcmd = new SqlCommand("SELECT * FROM SWApp_List_Equipment WHERE type = 'Actions Taken' ORDER BY order_no, name", conn);
                    break;
                default:
                    sqlcmd = new SqlCommand("SELECT * FROM SWApp_List_Equipment", conn);
                    break;
            }
            SqlDataAdapter da = new SqlDataAdapter(sqlcmd);
            DataTable dt = new DataTable();
            da.Fill(dt);
            foreach (DataRow dr in dt.Rows)
            {
                items.Add(dr["name"].ToString());
                CheckboxIDRecord = dr["id"].ToString();
                //items.Add(dr["VisitTime"] + " " + dr["PropPostcode"]);
            }

            return items;
        }

我已经遍历了 "checkboxlist" 中选择的每个值，这插入了每个选择的值：

foreach (var item in saw.actionsTakenCheckBoxList)
                {   //ADD ACTIONS AND REFERRAL 
                    SqlCommand add = new SqlCommand("INSERT INTO SWApp_CheckboxAnswers (SW_ID, Checkbox_ID, Checkbox_Section, Checkbox_Type, Checkbox_Answer) VALUES(@SW_ID,@Checkbox_ID,@Checkbox_Section,@Checkbox_Type,@Checkbox_Answer) ");
                    add.CommandType = CommandType.Text;
                    add.Connection = sqlcon;
                    add.Parameters.AddWithValue("@SW_ID", "");
                    add.Parameters.AddWithValue("@Checkbox_ID", "");
                    add.Parameters.AddWithValue("@Checkbox_Section", "");
                    add.Parameters.AddWithValue("@Checkbox_Type", "");
                    add.Parameters.AddWithValue("@Checkbox_Answer", "");
                    add.Parameters["@SW_ID"].Value = saw.EntryID.ToString();
                    add.Parameters["@Checkbox_ID"].Value = CheckboxIDRecord.ToString();
                    add.Parameters["@Checkbox_Section"].Value = "SmokeDetectionReferral";
                    add.Parameters["@Checkbox_Type"].Value = "";
                    add.Parameters["@Checkbox_Answer"].Value = item.ToString();
                    sqlcon.Open();
                    add.ExecuteNonQuery();
                    sqlcon.Close();
                }

如您所见，我目前尝试只输入在复选框列表中选择的第一个值的 ID。

目标：

目的是插入复选框的值 "name" 以及每个项目的 "id"。

研究：

我尝试按照这篇文章将项目放入一个数组中，但最终得到的是 'Array was out of bounds of the index'，这让我看到了第二篇文章。

Pass items from checkboxlist to SQL Server table

Index was out of bounds of array? c# forms

如有任何指导，我将不胜感激。谢谢。

Answer 1

我看到了几个问题，而不是试图纠正它们，这里是关于如何解决这个问题的建议。

可以在我关于 CheckedListBox 和 SQL-Server 的 MSDN 代码示例中看到总体情况，其中包括一个 sql 脚本来生成数据库和数据。

https://code.msdn.microsoft.com/Working-with-CheckedListBox-3b765442?redir=0

取自上面 link 中的 Operations.cs，此方法获取我们的数据（下一个代码块填充 CheckedListBox）

/// <summary>
/// Get all records to show in the CheckedListBox
/// </summary>
/// <returns></returns>
public DataTable GetAll()
{
    var dt = new DataTable();

    using (SqlConnection cn = new SqlConnection { ConnectionString = ConnectionString })
    {
        using (SqlCommand cmd = new SqlCommand { Connection = cn })
        {
            cmd.CommandText = "SELECT id, Description, Quantity, CheckedStatus FROM Products ---WHERE (Quantity > 0)";

            cn.Open();
            dt.Load(cmd.ExecuteReader());

        }
    }

    return dt;

}

表单代码

/// <summary>
/// Load CheckedListBox from database table
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Form1_Load(object sender, EventArgs e)
{

    var ops = new Operations();

    // read data from database table
    var dt = ops.GetAll();

    int LastIndex = 0;

    /*
        * Here we iterate the rows in the DataTable while in
        * CoursesCodeSample I set the DataSource of the CheckedListBox
        * to the DataTable. The method shown here has always been the
        * way to go as many indicated that since the DataSource property
        * of the CheckedListBox is not documented it could go away, well
        * many years later it's still here so guess what, it's okay.
        */
    foreach (DataRow row in dt.Rows)
    {
        checkedListBox1.Items.Add(new CheckListBoxItem()
        {
            Description = row.Field<string>("Description"),
            PrimaryKey = row.Field<int>("id"),
            Quantity = row.Field<int>("Quantity"),
            IsDirty = false
        });

        LastIndex = checkedListBox1.Items.Count - 1;
        checkedListBox1.SetItemChecked(LastIndex, row.Field<bool>("CheckedStatus"));

    }

    checkedListBox1.ItemCheck += CheckedListBox1_ItemCheck;

}

来自Opertions.cs - 插入方式

public void Insert(List<CheckListBoxItem> items)
{
    // optionally used for obtaining new primary key
    //int newIdentifier;

    using (SqlConnection cn = new SqlConnection { ConnectionString = ConnectionString })
    {
        using (SqlCommand cmd = new SqlCommand { Connection = cn })
        {
            // uncomment ending select statement and use commented to get new primary key
            cmd.CommandText = "INSERT INTO Products " + 
                "([Description],Quantity,CheckedStatus) " + 
                "VALUES (@Description,@Quantity,@CheckedStatus); " + 
                "-- SELECT CAST(scope_identity() AS int);";

            cmd.Parameters.Add(new SqlParameter()
                { ParameterName = "@Description", SqlDbType = SqlDbType.NVarChar });
            cmd.Parameters.Add(new SqlParameter()
                { ParameterName = "@Quantity", SqlDbType = SqlDbType.Int });
            cmd.Parameters.Add(new SqlParameter()
                { ParameterName = "@CheckedStatus", SqlDbType = SqlDbType.Bit });
            cmd.Parameters.Add(new SqlParameter()
                { ParameterName = "@CategoryIdentifier", SqlDbType = SqlDbType.Int });


            cn.Open();

            foreach (CheckListBoxItem item in items)
            {
                cmd.Parameters["@Description"].Value = item.Description;
                cmd.Parameters["@Quantity"].Value = item.Quantity;
                cmd.Parameters["@CheckedStatus"].Value = item.Checked;


                //newIdentifier = (int)cmd.ExecuteNonQuery();
                if ((int)cmd.ExecuteNonQuery() > -1)
                {
                    // inserted
                }
                else
                {
                    // failed
                }

            }
        }
    }
}

以上是基本的，注释掉的代码显示（如果需要）如何获取新的主键。

调用上面的方法

private void iterateButton_Click(object sender, EventArgs e)
{
    var items = new List<CheckListBoxItem>();

    for (int index = 0; index < checkedListBox1.Items.Count; index++)
    {
        if (((CheckListBoxItem)checkedListBox1.Items[index]).IsDirty)
        {
            items.Add(new CheckListBoxItem()
            {
                PrimaryKey = ((CheckListBoxItem)checkedListBox1.Items[index]).PrimaryKey,
                Checked = checkedListBox1.GetItemChecked(index),
                Description = ((CheckListBoxItem)checkedListBox1.Items[index]).Description
            });
        }
    }

    if (items.Count >0)
    {
        Ops.Insert(items);
    }
}

最后 class 用于填充 CheckedListBox

namespace CheckListBoxFromSQL_Server
{
    public class CheckListBoxItem
    {
        /// <summary>
        /// Identifier for database table
        /// </summary>
        public int PrimaryKey;
        /// <summary>
        /// Display member for CheckedListBox and a field in the table
        /// </summary>
        public string Description;
        public int Quantity;
        /// <summary>
        /// Indicates the checked state in the database table and for setting a Checked item in the CheckedListbox
        /// </summary>
        public bool Checked;
        /// <summary>
        /// Used to determine if a item changed after loaded in the CheckedListBox
        /// </summary>
        public bool IsDirty;
        public override string ToString() { return Description; }
    }
}

希望对您有所帮助

Answer 2

我为要放入复选框列表的项目实现了一个字典。这允许我使用复选框项目中的值，然后使用 INSERT 中的键到 SQL 数据库。

Dictionary<string, string> referral = new Dictionary<string, string>();

加载表单时用字典中的项目填充复选框列表。

private void Section3_Load(object sender, EventArgs e)
        { 
            SqlConnection conn = new SqlConnection(connectionString);
            SqlCommand cmd = new SqlCommand("select Id, name from SWApp_List_Equipment WHERE type = 'referral or signposting' ORDER BY order_no,name", conn);
            conn.Open();
            SqlDataReader dr = cmd.ExecuteReader();

            if (dr.HasRows)
            {
                while (dr.Read())
                {
                    referral.Add(dr["id"].ToString(), dr["name"].ToString());
                }
            }

            foreach (KeyValuePair<string, string> refs in referral)
            {
                box = new CheckBox();
                box.Text = refs.Value.ToString();
                actionsTakenCheckBoxList.Items.Add(box.Text);
                box.CheckedChanged += new EventHandler(this.CheckedChange);
            } 
        }

在表单的关闭按钮上将值插入 table。

private void closeButton_Click(object sender, EventArgs e)
        {
    using (SqlConnection sqlcon = new SqlConnection(connectionString)) {
                    //summary
                    foreach (var item in actionsTakenCheckBoxList.CheckedItems.OfType<string>().ToList())
                    {

                        //ADD ACTIONS AND REFERRAL 
                        SqlCommand add = new SqlCommand("INSERT INTO SWApp_CheckboxAnswers (SW_ID, Checkbox_ID, Checkbox_Section, Checkbox_Type, Checkbox_Answer) VALUES(@SW_ID,@Checkbox_ID,@Checkbox_Section,@Checkbox_Type,@Checkbox_Answer) ");
                        add.CommandType = CommandType.Text;
                        add.Connection = sqlcon;
                        add.Parameters.AddWithValue("@SW_ID", "");
                        add.Parameters.AddWithValue("@Checkbox_ID", "");
                        add.Parameters.AddWithValue("@Checkbox_Section", "");
                        add.Parameters.AddWithValue("@Checkbox_Type", "");
                        add.Parameters.AddWithValue("@Checkbox_Answer", "");
                        add.Parameters["@SW_ID"].Value = entry.entryID.ToString();
                        var myKey = referral.FirstOrDefault(x => x.Value == item.ToString()).Key;
                        add.Parameters["@Checkbox_ID"].Value = myKey;
                        add.Parameters["@Checkbox_Section"].Value = "SmokeDetection";
                        add.Parameters["@Checkbox_Type"].Value = "Referral";
                        add.Parameters["@Checkbox_Answer"].Value = item.ToString();
                        sqlcon.Open();
                        add.ExecuteNonQuery();
                        sqlcon.Close();

                    }
                }
}

C# - SQL 从 CheckboxList 插入复选框的值和 ID

C# - SQL Insert Value and ID of checkbox From CheckboxList

c#

sql-server

checkbox

checkboxlist