我的主窗体MainForm上有一个GridView，radGvA133s。我希望能够双击GridView的一行并打开一个新表单A133Form，以允许编辑所选行。
这是双击代码：
private void radGvA133s_DoubleClick(object sender, EventArgs e)
{
A133 oA133 = (A133)A133BindingSource.CurrencyManager.List[A133BindingSource.CurrencyManager.Position];
A133Form oA133Form = new A133Form();
oA133Form.NewA133 = oA133;
oA133Form.IsNew = false;
oA133Form.ShowDialog(this);
//On return - if not cancelled, then continue
if (oA133Form.Cancelled != true)
{
this.radGvA133s.Refresh();
}
oA133Form.Dispose();
oA133Form = null;
}
这是A133Form代码：
public partial class A133Form : Form
{
public A133Form()
{
InitializeComponent();
}
private bool _IsNew;
public bool IsNew
{
get
{
return _IsNew;
}
set
{
_IsNew = value;
}
}
private bool _Cancelled;
public bool Cancelled
{
get
{
return _Cancelled;
}
set
{
_Cancelled = value;
}
}
private A133 _newA133 = new A133();
public A133 NewA133
{
get
{
return _newA133;
}
set
{
_newA133 = value;
}
}
private void A133Form_Load(object sender, EventArgs e)
{
A133DB A133DB = new A133DB();
DataTable dtRSNs = A133DB.GetRSNList();
DataRow drFirstItem = dtRSNs.NewRow();
radComboRSN.DataSource = dtRSNs;
drFirstItem["rsn_id"] = "0";
drFirstItem["rsn_name"] = "";
dtRSNs.Rows.InsertAt(drFirstItem, 0);
radComboRSN.ValueMember = "rsn_id";
radComboRSN.DisplayMember = "rsn_name";
//Set databindings
radComboRSN.DataBindings.Add(new Binding("Text", NewA133, "RSN", true, DataSourceUpdateMode.OnPropertyChanged));
radTxtSubcontractor.DataBindings.Add(new Binding("Text", NewA133, "Subcontractor", true, DataSourceUpdateMode.OnPropertyChanged));
radMTxtCFDANumber.DataBindings.Add(new Binding("Text", NewA133, "CFDANumber", true, DataSourceUpdateMode.OnPropertyChanged));
radCbIncludeCFDA.DataBindings.Add(new Binding("Checked", NewA133, "IncludeCFDA", true, DataSourceUpdateMode.OnPropertyChanged));
radMTxtYear.DataBindings.Add(new Binding("Text", NewA133, "sYear", true, DataSourceUpdateMode.OnPropertyChanged));
radTxtFedAward.DataBindings.Add(new Binding("Text", NewA133, "FedAward", true, DataSourceUpdateMode.OnPropertyChanged));
radCbExceeds.DataBindings.Add(new Binding("Checked", NewA133, "Exceeds", true, DataSourceUpdateMode.OnPropertyChanged));
radDTPDateMHDReceived.DataBindings.Add(new Binding("Value", NewA133, "DateMHDReceived", true, DataSourceUpdateMode.OnPropertyChanged));
radDTPPeriodEnding.DataBindings.Add(new Binding("Value", NewA133, "PeriodEnding", true, DataSourceUpdateMode.OnPropertyChanged));
radDTPDateAudited.DataBindings.Add(new Binding("Value", NewA133, "DateAudited", true, DataSourceUpdateMode.OnPropertyChanged));
radDTPForwardDate.DataBindings.Add(new Binding("Value", NewA133, "ForwardDate", true, DataSourceUpdateMode.OnPropertyChanged));
radTxtSAOPerson.DataBindings.Add(new Binding("Text", NewA133, "SAOPerson", true, DataSourceUpdateMode.OnPropertyChanged));
}
private void radBtnCancel_Click(object sender, EventArgs e)
{
this.Cancelled = true;
this.Close();
}
private void radBtnSave_Click(object sender, EventArgs e)
{
this.Cancelled = false;
bool bValid = true;
foreach(Control control in this.Controls)
{
if (Convert.ToString(control.Tag) == "Required")
{
bool bMissingInfo = false;
if (control is RadDateTimePicker)
{
RadDateTimePicker dtp = control as RadDateTimePicker;
if (dtp.Value.ToString() == "1/1/0001 12:00:00 AM")
{
bMissingInfo = true;
}
}
else
{
if (string.IsNullOrEmpty(control.Text))
{
bMissingInfo = true;
}
}
if (bMissingInfo == true)
{
errorProvider1.SetError(control, "* Required Field");
bValid = false;
}
else
{
errorProvider1.SetError(control, "");
}
}
}
if (bValid == true)
{
bool bSaved = NewA133.SaveData();
if (bSaved == true)
{
this.Close();
}
else
{
MessageBox.Show("There was an error saving the data! If this continues, please contact technical assistance.",
"Error Saving Data", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
else
{
MessageBox.Show("The information you have entered is incomplete. Please fill out all required fields.",
"Missing Information", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
}
}
}
最后，这是A133类代码：
#region A133 Collection
public class A133Collection : BindingListView<A133>
{
public A133Collection() : base()
{
}
public A133Collection(List<A133> a133s) : base(a133s)
{
}
public A133Collection(DataTable dt)
{
foreach(DataRow oRow in dt.Rows)
{
A133 a = new A133(oRow);
this.Add(a);
}
}
private int FindMaxId()
{
int maxId = -1;
foreach(A133 a in this)
{
if (a.A133Id > maxId)
{
maxId = a.A133Id;
}
}
return maxId;
}
}
#endregion
#region A133 Class
///<summary>
///Class: A133
///Desc: Manages a single A133 business object
/// Note - 4 states for the object: Unchanged, Added, Deleted, Modified
/// Added flags that a brand new object was added; set prior to db insert
/// Deleted flags that the object was deleted; set after db delete
/// Unchanged is default state
/// Modified flags that props have changed
/// >> The IsDirty indicator looks to see if the object is "modified" or "added"
/// since these are pre-database flags
///</summary>
public class A133 : INotifyPropertyChanged, IEditableObject, IDataErrorInfo
{
//Declare internal class collection object
private A133Collection _A133s = new A133Collection();
//Declare internal class objects
private MHDFMS.BusinessLogic.A133DB _DB = new A133DB();
//Declare internal class props
private int _A133Id;
private string _RSN;
private string _Subcontractor;
private string _CFDANumber;
private string _IncludeCFDA;
private string _Year;
private string _FedAward;
private string _Exceeds;
private string _DateMHDReceived;
private string _PeriodEnding;
private string _DateAudited;
private string _ForwardDate;
private string _SAOPerson;
private int _OldA133Id;
private string _OldRSN;
private string _OldSubcontractor;
private string _OldCFDANumber;
private string _OldIncludeCFDA;
private string _OldYear;
private string _OldFedAward;
private string _OldExceeds;
private string _OldDateMHDReceived;
private string _OldPeriodEnding;
private string _OldDateAudited;
private string _OldForwardDate;
private string _OldSAOPerson;
private bool _Editing;
private string _Error = string.Empty;
private EntityStateEnum _EntityState;
private Hashtable _PropErrors = new Hashtable();
private void FirePropertyChangeNotification(string propName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propName));
}
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
#endregion
public A133()
{
this.EntityState = EntityStateEnum.Unchanged;
}
public A133(DataRow dr)
{
//Populates the business object item from a data row
this.A133Id = Convert.ToInt32(dr["a133_id"]);
this.RSN = dr["rsn"].ToString();
this.Subcontractor = dr["subcontractor"].ToString();
this.CFDANumber = dr["cfda_no"].ToString();
this.IncludeCFDA = dr["include_cfda"].ToString();
this.sYear = dr["year"].ToString();
this.FedAward = dr["fed_award"].ToString();
this.Exceeds = dr["exceeds"].ToString();
if (dr["date_mhd_received"] != null)
{
this.DateMHDReceived = Convert.ToDateTime(dr["date_mhd_received"]).ToShortDateString();
}
if (dr["period_ending"] != null)
{
this.PeriodEnding = Convert.ToDateTime(dr["period_ending"]).ToShortDateString();
}
if (dr["date_audited"] != null)
{
this.DateAudited = Convert.ToDateTime(dr["date_audited"]).ToShortDateString();
}
if (dr["forward_date"] != null)
{
this.ForwardDate = Convert.ToDateTime(dr["forward_date"]).ToShortDateString();
}
this.SAOPerson = dr["sao_person"].ToString();
this.EntityState = EntityStateEnum.Unchanged;
}
#region Public Methods/Constructors
public bool SaveData()
{
bool bSaved = false;
if (this.A133Id == 0)
{
bSaved = _DB.SaveA133Data(this);
}
else
{
bSaved = _DB.SaveA133Data(this);
}
if (bSaved == true)
{
this.EntityState = EntityStateEnum.Unchanged;
}
return bSaved;
}
public bool Delete()
{
bool bSaved = _DB.SaveA133AsInactive(this);
if (bSaved == true)
{
this.EntityState = EntityStateEnum.Deleted;
}
return bSaved;
}
public Int32 A133Id
{
get
{
return _A133Id;
}
set
{
_A133Id = value;
}
}
public string RSN
{
get
{
return _RSN;
}
set
{
_RSN = value;
FirePropertyChangeNotification("RSN");
}
}
public string Subcontractor
{
get
{
return _Subcontractor;
}
set
{
_Subcontractor = value;
FirePropertyChangeNotification("Subcontractor");
}
}
public string CFDANumber
{
get
{
return _CFDANumber;
}
set
{
_CFDANumber = value;
FirePropertyChangeNotification("CFDANumber");
}
}
public string IncludeCFDA
{
get
{
return _IncludeCFDA;
}
set
{
_IncludeCFDA = value;
FirePropertyChangeNotification("IncludeCFDA");
}
}
public string sYear
{
get
{
return _Year;
}
set
{
_Year = value;
FirePropertyChangeNotification("sYear");
}
}
public string FedAward
{
get
{
return _FedAward;
}
set
{
_FedAward = value;
FirePropertyChangeNotification("FedAward");
}
}
public string Exceeds
{
get
{
return _Exceeds;
}
set
{
_Exceeds = value;
FirePropertyChangeNotification("Exceeds");
}
}
public string DateMHDReceived
{
get
{
return _DateMHDReceived;
}
set
{
_DateMHDReceived = value;
FirePropertyChangeNotification("DateMHDReceived");
}
}
public string PeriodEnding
{
get
{
return _PeriodEnding;
}
set
{
_PeriodEnding = value;
FirePropertyChangeNotification("PeriodEnding");
}
}
public string DateAudited
{
get
{
return _DateAudited;
}
set
{
_DateAudited = value;
FirePropertyChangeNotification("DateAudited");
}
}
public string ForwardDate
{
get
{
return _ForwardDate;
}
set
{
_ForwardDate = value;
FirePropertyChangeNotification("ForwardDate");
}
}
public string SAOPerson
{
get
{
return _SAOPerson;
}
set
{
_SAOPerson = value;
FirePropertyChangeNotification("SAOPerson");
}
}
public Boolean IsDirty
{
get
{
return ((this.EntityState != EntityStateEnum.Unchanged) || (this.EntityState != EntityStateEnum.Deleted));
}
}
public enum EntityStateEnum
{
Unchanged,
Added,
Deleted,
Modified
}
public A133Collection A133s
{
get
{
return _A133s;
}
}
void IEditableObject.BeginEdit()
{
if (!_Editing)
{
_OldA133Id = _A133Id;
_OldRSN = _RSN;
_OldSubcontractor = _Subcontractor;
_OldCFDANumber = _CFDANumber;
_OldIncludeCFDA = _IncludeCFDA;
_OldYear = _Year;
_OldFedAward = _FedAward;
_OldExceeds = _Exceeds;
_OldDateMHDReceived = _DateMHDReceived;
_OldPeriodEnding = _PeriodEnding;
_OldDateAudited = _DateAudited;
_OldForwardDate = _ForwardDate;
_OldSAOPerson = _SAOPerson;
}
this.EntityState = EntityStateEnum.Modified;
_Editing = true;
}
void IEditableObject.CancelEdit()
{
if (_Editing)
{
_A133Id = _OldA133Id;
_RSN = _OldRSN;
_Subcontractor = _OldSubcontractor;
_CFDANumber = _OldCFDANumber;
_IncludeCFDA = _OldIncludeCFDA;
_Year = _OldYear;
_FedAward = _OldFedAward;
_Exceeds = _OldExceeds;
_DateMHDReceived = _OldDateMHDReceived;
_PeriodEnding = _OldPeriodEnding;
_DateAudited = _OldDateAudited;
_ForwardDate = _OldForwardDate;
_SAOPerson = _OldSAOPerson;
}
this.EntityState = EntityStateEnum.Unchanged;
_Editing = false;
}
void IEditableObject.EndEdit()
{
_Editing = false;
}
public EntityStateEnum EntityState
{
get
{
return _EntityState;
}
set
{
_EntityState = value;
}
}
string IDataErrorInfo.Error
{
get
{
return _Error;
}
}
string IDataErrorInfo.this[string columnName]
{
get
{
return (string)_PropErrors[columnName];
}
}
private void DataStateChanged(EntityStateEnum dataState, string propertyName)
{
//Raise the event
if (PropertyChanged != null && propertyName != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
//If the state is deleted, mark it as deleted
if (dataState == EntityStateEnum.Deleted)
{
this.EntityState = dataState;
}
if (this.EntityState == EntityStateEnum.Unchanged)
{
this.EntityState = dataState;
}
}
#endregion
}
#endregion
不幸的是，当我双击GridView时，我收到此错误：“InvalidCastException未处理。无法将类型为'System.Data.DataRowView'的对象强制转换为'MHDFMS.BusinessLogic.A133'”
此错误发生在双击事件的第一行。
我在这里不知所措，已经把头发拉了一段时间。我错过了一些明显的东西吗是否有更简单（或更好！）的方式来实现我想要的结果？
非常感谢任何帮助！
答案 0 :(得分：2)
试试这个：
DataRowView currentRow = A133BindingSource.CurrencyManager.List[A133BindingSource.CurrencyManager.Position] as DataRowView;
A133Form oA133Form = new A133Form();
oA133Form.NewA133 = new A133(currentRow.Row);
答案 1 :(得分：1)
您忘记发布导致异常的事件处理程序......;）
但问题的根源似乎很明显 - 你从属性网格中得到一个DataRowView对象，并尝试将它（可能通过分配给一个变量）转换为A133你可能想要{ {1}}。