多个动态创建的组合框不触发事件处理程序 C#
Multiple dynamically created comboboxes not triggering event handlers C#
以下代码适用于桌面应用程序，而非网络应用程序。我基本上创建了一行动态控件来收集联系人的 phone 信息。如果用户想要为联系信息添加额外的一行，可以在每行的末尾按下一个按钮。
问题 1：每一行都有两个组合框（cmbo_PhoneType 和 cmbo_BestCalltime），并附有事件处理程序。对于用户创建的每一行，事件处理程序 cmbo_PhoneType.SelectedIndexChanged && cmbo_BestCallTime.SelectedIndexChanged 不会触发单个组合框。
问题 2：用户可见的 selected 列表项永远不会改变。例如，他们 select“Home”...组合框会找到它并追加，但是一旦用户离开组合框，selection（对于所有组合框）默认返回到列表。
如果这是一个网络应用程序，我认为它会与回发和视图状态相关（我还没有创建视图状态，但一旦我解决了这些问题就会），但因为这是一个桌面应用程序，我不确定。我错过了什么？
public partial class frmTestPhoneRows : Form
{
int leftControl = 1;
int StartPos = 88;
ComboBox cmbo_phoneType = new ComboBox();
MaskedTextBox msk_phone = new MaskedTextBox();
TextBox txt_ext = new TextBox();
ComboBox cmbo_BestCallTime = new ComboBox();
CheckBox isMobile = new CheckBox();
CheckBox verified = new CheckBox();
CheckBox SubscribeToTexts = new CheckBox();
Button btn_addNew = new Button();
public frmTestPhoneRows()
{
InitializeComponent();
createNewRow();
}
private void frmTestPhoneRows_Load(object sender, EventArgs e)
{
}
void createNewRow()
{
//connection string redacted
MySqlConnection reConn = new MySqlConnection(sConnection);
reConn.Open();
MySqlCommand phoneTypeCommand = new MySqlCommand("Select * from lutable_phonetype order by Type", reConn);
MySqlDataAdapter phoneTypeAdapter = new MySqlDataAdapter();
DataTable phoneTypeTable = new DataTable();
phoneTypeAdapter.SelectCommand = phoneTypeCommand;
phoneTypeAdapter.Fill(phoneTypeTable);
MySqlCommand bestCallTimeCommand = new MySqlCommand("Select * from lutble_bestcalltime ORDER by CallTime", reConn);
MySqlDataAdapter bestCallTimeAdapter = new MySqlDataAdapter();
DataTable bestCallTimeTable = new DataTable();
bestCallTimeAdapter.SelectCommand = bestCallTimeCommand;
bestCallTimeAdapter.Fill(bestCallTimeTable);
ComboBox cmbo_newPhoneType = new ComboBox();
this.Controls.Add(cmbo_newPhoneType);
cmbo_newPhoneType.Size = new Size(121, 20);
cmbo_newPhoneType.DropDownStyle = ComboBoxStyle.DropDown;
cmbo_newPhoneType.AutoCompleteMode = AutoCompleteMode.Append;
cmbo_newPhoneType.AutoCompleteSource = AutoCompleteSource.ListItems;
cmbo_newPhoneType.Top = leftControl * StartPos;
cmbo_newPhoneType.Left = 18;
cmbo_newPhoneType.Font = new Font(this.Font.FontFamily, 9);
cmbo_newPhoneType.BackColor = Color.LightBlue;
cmbo_newPhoneType.ForeColor = Color.DarkBlue;
cmbo_newPhoneType.DataSource = phoneTypeTable;
cmbo_newPhoneType.DisplayMember = "Type";
cmbo_newPhoneType.ValueMember = "TypeID";
cmbo_newPhoneType.DataBindings.Add("Selectedvalue", phoneTypeTable, "TypeID");
cmbo_newPhoneType.SelectedIndexChanged += new System.EventHandler(phoneType_SelectedIndexChanged);
MaskedTextBox msk_NewPhone = new MaskedTextBox();
this.Controls.Add(msk_NewPhone);
msk_NewPhone.Size = new Size(100, 20);
msk_NewPhone.Top = leftControl * StartPos;
msk_NewPhone.Left = 143;
msk_NewPhone.Font = new Font(this.Font.FontFamily, 9);
msk_NewPhone.BackColor = Color.LightBlue;
msk_NewPhone.ForeColor = Color.DarkBlue;
msk_NewPhone.Mask = "(000) 000-0000";
TextBox txt_newExt = new TextBox();
this.Controls.Add(txt_newExt);
txt_newExt.Size = new Size(61, 20);
txt_newExt.Top = leftControl * StartPos;
txt_newExt.Left = 247;
txt_newExt.Font = new Font(this.Font.FontFamily, 9);
txt_newExt.BackColor = Color.LightBlue;
txt_newExt.ForeColor = Color.DarkBlue;
ComboBox cmbo_newBestCallTime = new ComboBox();
this.Controls.Add(cmbo_newBestCallTime);
cmbo_newBestCallTime.Size = new Size(231, 20);
cmbo_newBestCallTime.DropDownStyle = ComboBoxStyle.DropDown;
cmbo_newBestCallTime.AutoCompleteMode = AutoCompleteMode.Append;
cmbo_newBestCallTime.AutoCompleteSource = AutoCompleteSource.ListItems;
cmbo_newBestCallTime.Top = leftControl * StartPos;
cmbo_newBestCallTime.Left = 312;
cmbo_newBestCallTime.Font = new Font(this.Font.FontFamily, 9);
cmbo_newBestCallTime.BackColor = Color.LightBlue;
cmbo_newBestCallTime.ForeColor = Color.DarkBlue;
cmbo_newBestCallTime.DataSource = bestCallTimeTable;
cmbo_newBestCallTime.DisplayMember = "CallTime";
cmbo_newBestCallTime.ValueMember = "CallTimeId";
cmbo_newBestCallTime.DataBindings.Add("Selectedvalue", bestCallTimeTable, "CallTimeId");
cmbo_newBestCallTime.SelectedIndexChanged += new System.EventHandler(cmboBestCallTime_SelectedIndexChanged);
CheckBox chkbx_newVerified = new CheckBox();
this.Controls.Add(chkbx_newVerified);
chkbx_newVerified.CheckState = CheckState.Unchecked;
chkbx_newVerified.Text = "Verified";
chkbx_newVerified.Size = new Size(75, 20);
chkbx_newVerified.Top = leftControl * StartPos;
chkbx_newVerified.Left = 547;
chkbx_newVerified.Font = new Font(this.Font.FontFamily, 9);
chkbx_newVerified.BackColor = Color.LightBlue;
chkbx_newVerified.ForeColor = Color.DarkBlue;
CheckBox chkbx_newIsMobile = new CheckBox();
this.Controls.Add(chkbx_newIsMobile);
chkbx_newIsMobile.CheckState = CheckState.Unchecked;
chkbx_newIsMobile.Text = "Mobile";
chkbx_newIsMobile.Size = new Size(70, 20);
chkbx_newIsMobile.Top = leftControl * StartPos;
chkbx_newIsMobile.Left = 626;
chkbx_newIsMobile.Font = new Font(this.Font.FontFamily, 9);
chkbx_newIsMobile.BackColor = Color.LightBlue;
chkbx_newIsMobile.ForeColor = Color.DarkBlue;
CheckBox chkbx_newSubscribeToTexts = new CheckBox();
this.Controls.Add(chkbx_newSubscribeToTexts);
chkbx_newSubscribeToTexts.CheckState = CheckState.Unchecked;
chkbx_newSubscribeToTexts.Text = "Subscribe To Texts";
chkbx_newSubscribeToTexts.Size = new Size(156, 20);
chkbx_newSubscribeToTexts.Top = leftControl * StartPos;
chkbx_newSubscribeToTexts.Left = 700;
chkbx_newSubscribeToTexts.Font = new Font(Font.FontFamily, 9);
chkbx_newSubscribeToTexts.BackColor = Color.LightBlue;
chkbx_newSubscribeToTexts.ForeColor = Color.DarkBlue;
Button btn_newAddNew = new Button();
this.Controls.Add(btn_newAddNew);
btn_newAddNew.Size = new Size(75, 20);
btn_newAddNew.BackColor = Color.DarkBlue;
btn_newAddNew.ForeColor = Color.LightBlue;
btn_newAddNew.Text = "Add Another";
btn_newAddNew.Top = leftControl * StartPos;
btn_newAddNew.Left = 860;
btn_newAddNew.Click += new System.EventHandler(btn_addNew_Click);
}
private void phoneType_SelectedIndexChanged(object sender, EventArgs e)
{
cmbo_phoneType.DataBindings.Clear();
}
private void cmboBestCallTime_SelectedIndexChanged(object sender, EventArgs e)
{
cmbo_BestCallTime.DataBindings.Clear();
}
private void btn_addNew_Click(object sender, EventArgs e)
{
StartPos = StartPos + 28;
createNewRow();
}
连接动态控件时，事件的 SOURCE 将通过 SENDER 参数传递给事件处理程序。
将“发件人”转换为适当的控件类型，然后对其进行操作：
private void phoneType_SelectedIndexChanged(object sender, EventArgs e)
{
ComboBox cb = (ComboBox)sender;
cb.DataBindings.Clear();
}
private void cmboBestCallTime_SelectedIndexChanged(object sender, EventArgs e)
{
ComboBox cb = (ComboBox)sender;
cb.DataBindings.Clear();
}
以下代码适用于桌面应用程序，而非网络应用程序。我基本上创建了一行动态控件来收集联系人的 phone 信息。如果用户想要为联系信息添加额外的一行，可以在每行的末尾按下一个按钮。
问题 1：每一行都有两个组合框（cmbo_PhoneType 和 cmbo_BestCalltime），并附有事件处理程序。对于用户创建的每一行，事件处理程序 cmbo_PhoneType.SelectedIndexChanged && cmbo_BestCallTime.SelectedIndexChanged 不会触发单个组合框。
问题 2：用户可见的 selected 列表项永远不会改变。例如，他们 select“Home”...组合框会找到它并追加，但是一旦用户离开组合框，selection（对于所有组合框）默认返回到列表。
如果这是一个网络应用程序，我认为它会与回发和视图状态相关（我还没有创建视图状态，但一旦我解决了这些问题就会），但因为这是一个桌面应用程序，我不确定。我错过了什么？
public partial class frmTestPhoneRows : Form
{
int leftControl = 1;
int StartPos = 88;
ComboBox cmbo_phoneType = new ComboBox();
MaskedTextBox msk_phone = new MaskedTextBox();
TextBox txt_ext = new TextBox();
ComboBox cmbo_BestCallTime = new ComboBox();
CheckBox isMobile = new CheckBox();
CheckBox verified = new CheckBox();
CheckBox SubscribeToTexts = new CheckBox();
Button btn_addNew = new Button();
public frmTestPhoneRows()
{
InitializeComponent();
createNewRow();
}
private void frmTestPhoneRows_Load(object sender, EventArgs e)
{
}
void createNewRow()
{
//connection string redacted
MySqlConnection reConn = new MySqlConnection(sConnection);
reConn.Open();
MySqlCommand phoneTypeCommand = new MySqlCommand("Select * from lutable_phonetype order by Type", reConn);
MySqlDataAdapter phoneTypeAdapter = new MySqlDataAdapter();
DataTable phoneTypeTable = new DataTable();
phoneTypeAdapter.SelectCommand = phoneTypeCommand;
phoneTypeAdapter.Fill(phoneTypeTable);
MySqlCommand bestCallTimeCommand = new MySqlCommand("Select * from lutble_bestcalltime ORDER by CallTime", reConn);
MySqlDataAdapter bestCallTimeAdapter = new MySqlDataAdapter();
DataTable bestCallTimeTable = new DataTable();
bestCallTimeAdapter.SelectCommand = bestCallTimeCommand;
bestCallTimeAdapter.Fill(bestCallTimeTable);
ComboBox cmbo_newPhoneType = new ComboBox();
this.Controls.Add(cmbo_newPhoneType);
cmbo_newPhoneType.Size = new Size(121, 20);
cmbo_newPhoneType.DropDownStyle = ComboBoxStyle.DropDown;
cmbo_newPhoneType.AutoCompleteMode = AutoCompleteMode.Append;
cmbo_newPhoneType.AutoCompleteSource = AutoCompleteSource.ListItems;
cmbo_newPhoneType.Top = leftControl * StartPos;
cmbo_newPhoneType.Left = 18;
cmbo_newPhoneType.Font = new Font(this.Font.FontFamily, 9);
cmbo_newPhoneType.BackColor = Color.LightBlue;
cmbo_newPhoneType.ForeColor = Color.DarkBlue;
cmbo_newPhoneType.DataSource = phoneTypeTable;
cmbo_newPhoneType.DisplayMember = "Type";
cmbo_newPhoneType.ValueMember = "TypeID";
cmbo_newPhoneType.DataBindings.Add("Selectedvalue", phoneTypeTable, "TypeID");
cmbo_newPhoneType.SelectedIndexChanged += new System.EventHandler(phoneType_SelectedIndexChanged);
MaskedTextBox msk_NewPhone = new MaskedTextBox();
this.Controls.Add(msk_NewPhone);
msk_NewPhone.Size = new Size(100, 20);
msk_NewPhone.Top = leftControl * StartPos;
msk_NewPhone.Left = 143;
msk_NewPhone.Font = new Font(this.Font.FontFamily, 9);
msk_NewPhone.BackColor = Color.LightBlue;
msk_NewPhone.ForeColor = Color.DarkBlue;
msk_NewPhone.Mask = "(000) 000-0000";
TextBox txt_newExt = new TextBox();
this.Controls.Add(txt_newExt);
txt_newExt.Size = new Size(61, 20);
txt_newExt.Top = leftControl * StartPos;
txt_newExt.Left = 247;
txt_newExt.Font = new Font(this.Font.FontFamily, 9);
txt_newExt.BackColor = Color.LightBlue;
txt_newExt.ForeColor = Color.DarkBlue;
ComboBox cmbo_newBestCallTime = new ComboBox();
this.Controls.Add(cmbo_newBestCallTime);
cmbo_newBestCallTime.Size = new Size(231, 20);
cmbo_newBestCallTime.DropDownStyle = ComboBoxStyle.DropDown;
cmbo_newBestCallTime.AutoCompleteMode = AutoCompleteMode.Append;
cmbo_newBestCallTime.AutoCompleteSource = AutoCompleteSource.ListItems;
cmbo_newBestCallTime.Top = leftControl * StartPos;
cmbo_newBestCallTime.Left = 312;
cmbo_newBestCallTime.Font = new Font(this.Font.FontFamily, 9);
cmbo_newBestCallTime.BackColor = Color.LightBlue;
cmbo_newBestCallTime.ForeColor = Color.DarkBlue;
cmbo_newBestCallTime.DataSource = bestCallTimeTable;
cmbo_newBestCallTime.DisplayMember = "CallTime";
cmbo_newBestCallTime.ValueMember = "CallTimeId";
cmbo_newBestCallTime.DataBindings.Add("Selectedvalue", bestCallTimeTable, "CallTimeId");
cmbo_newBestCallTime.SelectedIndexChanged += new System.EventHandler(cmboBestCallTime_SelectedIndexChanged);
CheckBox chkbx_newVerified = new CheckBox();
this.Controls.Add(chkbx_newVerified);
chkbx_newVerified.CheckState = CheckState.Unchecked;
chkbx_newVerified.Text = "Verified";
chkbx_newVerified.Size = new Size(75, 20);
chkbx_newVerified.Top = leftControl * StartPos;
chkbx_newVerified.Left = 547;
chkbx_newVerified.Font = new Font(this.Font.FontFamily, 9);
chkbx_newVerified.BackColor = Color.LightBlue;
chkbx_newVerified.ForeColor = Color.DarkBlue;
CheckBox chkbx_newIsMobile = new CheckBox();
this.Controls.Add(chkbx_newIsMobile);
chkbx_newIsMobile.CheckState = CheckState.Unchecked;
chkbx_newIsMobile.Text = "Mobile";
chkbx_newIsMobile.Size = new Size(70, 20);
chkbx_newIsMobile.Top = leftControl * StartPos;
chkbx_newIsMobile.Left = 626;
chkbx_newIsMobile.Font = new Font(this.Font.FontFamily, 9);
chkbx_newIsMobile.BackColor = Color.LightBlue;
chkbx_newIsMobile.ForeColor = Color.DarkBlue;
CheckBox chkbx_newSubscribeToTexts = new CheckBox();
this.Controls.Add(chkbx_newSubscribeToTexts);
chkbx_newSubscribeToTexts.CheckState = CheckState.Unchecked;
chkbx_newSubscribeToTexts.Text = "Subscribe To Texts";
chkbx_newSubscribeToTexts.Size = new Size(156, 20);
chkbx_newSubscribeToTexts.Top = leftControl * StartPos;
chkbx_newSubscribeToTexts.Left = 700;
chkbx_newSubscribeToTexts.Font = new Font(Font.FontFamily, 9);
chkbx_newSubscribeToTexts.BackColor = Color.LightBlue;
chkbx_newSubscribeToTexts.ForeColor = Color.DarkBlue;
Button btn_newAddNew = new Button();
this.Controls.Add(btn_newAddNew);
btn_newAddNew.Size = new Size(75, 20);
btn_newAddNew.BackColor = Color.DarkBlue;
btn_newAddNew.ForeColor = Color.LightBlue;
btn_newAddNew.Text = "Add Another";
btn_newAddNew.Top = leftControl * StartPos;
btn_newAddNew.Left = 860;
btn_newAddNew.Click += new System.EventHandler(btn_addNew_Click);
}
private void phoneType_SelectedIndexChanged(object sender, EventArgs e)
{
cmbo_phoneType.DataBindings.Clear();
}
private void cmboBestCallTime_SelectedIndexChanged(object sender, EventArgs e)
{
cmbo_BestCallTime.DataBindings.Clear();
}
private void btn_addNew_Click(object sender, EventArgs e)
{
StartPos = StartPos + 28;
createNewRow();
}
连接动态控件时，事件的 SOURCE 将通过 SENDER 参数传递给事件处理程序。
将“发件人”转换为适当的控件类型，然后对其进行操作：
private void phoneType_SelectedIndexChanged(object sender, EventArgs e)
{
ComboBox cb = (ComboBox)sender;
cb.DataBindings.Clear();
}
private void cmboBestCallTime_SelectedIndexChanged(object sender, EventArgs e)
{
ComboBox cb = (ComboBox)sender;
cb.DataBindings.Clear();
}