[英]change textbox value if i change combobox value
這是我的表格
這是我的存儲庫
區域存儲庫
public string GetAreaNamebyAreaID(int areaID)
{
var result = db.btbArea.SingleOrDefault(g => g.AreaID == areaID);
if (result == null)
return string.Empty;
return result.AreaName;
}
Howzeh存儲庫
public string GetHowzehNamebyHoezehID(int howzehID)
{
var result = db.btbHowzeh.SingleOrDefault(g => g.HowzehID == howzehID);
if (result == null)
return string.Empty;
return result.HowzehName;
}
Paygah存儲庫
public string GetPaygahNamebyPaygahID(int paygahID)
{
var result = db.btbPaygah.SingleOrDefault(g => g.PaygahID == paygahID);
if (result == null)
return string.Empty;
return result.PaygahName;
}
如果我更改 combobox 索引,我將嘗試加載我的文本框值
private void frmAreasManage_Load(object sender, EventArgs e)
{
//Load AreaComboBox Source from AreaTable
using (UnitOfWork db = new UnitOfWork())
{
cmbAreaNumber.DataSource = db.AreaRepository.Get();
cmbAreaNumber.DisplayMember = "AreaNumber";
cmbAreaNumber.ValueMember = "AreaID";
}
}
private void cmbAreaNumber_SelectedIndexChanged(object sender, EventArgs e)
{
cmbAreaNumber.SelectedIndex = 0;
string selectedValue = cmbAreaNumber.SelectedValue.ToString();
using (UnitOfWork db = new UnitOfWork())
if (!string.IsNullOrEmpty(selectedValue))
{
{
//Load HowzehhComboBox From HowzehTable Filter By AreaID
cmbHowzehNumber.DataSource = db.HowzehRepository.GetNameIDByFilter(selectedValue);
cmbHowzehNumber.DisplayMember = "HowzehNumber";
cmbHowzehNumber.ValueMember = "HowzehID";
//Get AreaName from AreaTable Filter By AreaID
txtAreaName.Text = db.AreaRepository.GetAreaNamebyAreaID(Convert.ToInt32(cmbAreaNumber.SelectedValue));
}
}
}
private void cmbHowzehNumber_SelectedIndexChanged(object sender, EventArgs e)
{
string selectedValue = cmbHowzehNumber.SelectedValue.ToString();
using (UnitOfWork db = new UnitOfWork())
if (!string.IsNullOrEmpty(selectedValue))
{
//Load PaygahComboBox From PaygahTable Filter By HowzehID
cmbPaygahNumber.DataSource = db.PaygahRepository.GetNameIDByFilter(selectedValue);
cmbPaygahNumber.DisplayMember = "PaygahNumber";
cmbPaygahNumber.ValueMember = "PaygahID";
//Get HowzehName from HowzehTable Filter By HowzehID
txtHowzehName.Text = db.HowzehRepository.GetHowzehNamebyHoezehID(Convert.ToInt32(selectedValue));
}
}
private void cmbPaygahNumber_SelectedIndexChanged(object sender, EventArgs e)
{
using (UnitOfWork db = new UnitOfWork())
{
//Get HowzehName from HowzehTable Filter By HowzehID
txtPaygahName.Text = db.PaygahRepository.GetPaygahNamebyPaygahID(Convert.ToInt32(selectedValue));
}
}
}
在我開始我的代碼后,我收到了這個錯誤
我處理我的 null 如果我忽略這條線一切都很好!
這段代碼解決了我的問題(如果我找到解決我的問題的方法,我總是回答我的問題以幫助其他人)
private void frmAreasManage_Load(object sender, EventArgs e)
{
//Load AreaComboBox Source from AreaTable
using (UnitOfWork db = new UnitOfWork())
{
// At first assign properties DisplayMember and ValueMember.
cmbAreaNumber.DisplayMember = "AreaNumber";
cmbAreaNumber.ValueMember = "AreaID";
// And then assign DataSource property of the cmbLayerName.
cmbAreaNumber.DataSource = db.AreaRepository.Get();
}
}
private void cmbAreaNumber_SelectedIndexChanged(object sender, EventArgs e)
{
string selectedValue = cmbAreaNumber.SelectedValue.ToString();
using (UnitOfWork db = new UnitOfWork())
if (!string.IsNullOrEmpty(selectedValue))
{
/// At first assign properties DisplayMember and ValueMember.
cmbHowzehNumber.DisplayMember = "HowzehNumber";
cmbHowzehNumber.ValueMember = "HowzehID";
// And then assign DataSource property of the cmbHowzehNumber.
cmbHowzehNumber.DataSource = db.HowzehRepository.GetNameIDByFilter(selectedValue);
//Get AreaName from AreaTable Filter By AreaID
txtAreaName.Text = db.AreaRepository.GetAreaNamebyAreaID(Convert.ToInt32(selectedValue));
}
}
private void cmbHowzehNumber_SelectedIndexChanged(object sender, EventArgs e)
{
string selectedValue = cmbHowzehNumber.SelectedValue.ToString();
using (UnitOfWork db = new UnitOfWork())
if (!string.IsNullOrEmpty(selectedValue))
{
//Load PaygahComboBox From PaygahTable Filter By HowzehID
cmbPaygahNumber.DataSource = db.PaygahRepository.GetNameIDByFilter(selectedValue);
cmbPaygahNumber.DisplayMember = "PaygahNumber";
cmbPaygahNumber.ValueMember = "PaygahID";
//Get HowzehName from HowzehTable Filter By HowzehID
txtHowzehName.Text = db.HowzehRepository.GetHowzehNamebyHoezehID(Convert.ToInt32(selectedValue));
}
}
private void cmbPaygahNumber_SelectedIndexChanged(object sender, EventArgs e)
{
string selectedValue = cmbHowzehNumber.SelectedValue.ToString();
using (UnitOfWork db = new UnitOfWork())
{
//Get HowzehName from HowzehTable Filter By HowzehID
txtPaygahName.Text = db.PaygahRepository.GetPaygahNamebyPaygahID(Convert.ToInt32(selectedValue));
}
}
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