我正在创建一个C＃windows窗体应用程序来管理发票，我需要一些帮助，看看我是否朝着正确的方向前进。我需要：
我知道我可能需要使用DataGridView来实现这一点，但我不确定将它绑定到什么。本文来自MSDN looks promising，但我不确定如何填充数据库表中的BindingList类。本文正在调用Add方法来添加单个行，但我希望能够一次添加所有行（或至少在那里有一个循环，用几行代码添加它们）。
我认为可以使用BindingList类。此外，BindingList类是否支持行过滤，类似于RowFilter类的DataView属性？还有一篇关于StackOverflow的文章引用了这个类，但它没有提供有关如何从数据库中填充BindingList，如何对其应用过滤器或如何在实际中更改行中的行的详细信息。 DataGridView。
MSDN article似乎没有对DGV本身进行更改，而是对基础数据源进行更改，然后通过INotifyPropertyChanged接口更新DGV。我知道需要发挥什么，我只需要一些帮助来安排碎片。感谢所有帮助！
我想出了这个，下面的代码作为其他需要帮助的人的一个例子。这可能是也可能不是最好的方法，但它对我有用。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace Insurance_Manager
{
public partial class InvoiceEditor : Form
{
private Boolean ignoreChange = false;
private Char type;
private DataTable invoices;
private SqlDataAdapter adapter;
#region Class Constructors
public InvoiceEditor(Char iType)
{
// Initialize window components
InitializeComponent();
type = iType;
}
#endregion
#region Class Methods
// This function calculates the grid totals
private void CalculateTotals()
{
// Initialize values
Double all = 0;
Double doNotPay = 0;
Double paid = 0;
Double wrongAmount = 0;
// Loop through each row in the displayable grid and total the rows
foreach (DataRowView viewRow in invoices.DefaultView)
{
DataRow row = viewRow.Row;
all += Double.Parse(row["Amount"].ToString());
if (Boolean.Parse(row["DoNotPay"].ToString()) == true) { doNotPay += Double.Parse(row["Amount"].ToString()); }
if (Boolean.Parse(row["Paid"].ToString()) == true) { paid += Double.Parse(row["Amount"].ToString()); }
if (Boolean.Parse(row["WrongAmount"].ToString()) == true) { wrongAmount += Double.Parse(row["Amount"].ToString()); }
}
// Set the totals to the textbox
tbAllTotal.Text = String.Format(all.ToString(), "{0:c}");
tbDoNotPayTotal.Text = String.Format(doNotPay.ToString(), "{0:c}");
tbPaidTotal.Text = String.Format(paid.ToString(), "{0:c}");
tbWrongAmtTotal.Text = String.Format(wrongAmount.ToString(), "{0:c}");
}
// This functions loads the invoices for the grid
private void LoadInvoices()
{
// Fill the data table
SqlConnection conn = new SqlConnection("Data Source=REPORTSERVER;Initial Catalog=Insurance;Integrated Security=True");
conn.Open();
String query = "";
query += "Select ";
query += " IsNull(C.CustomerName,'') CustomerName, ";
query += " IsNull(C.[Contract],'') [Contract], ";
query += " IsNull(Convert(VarChar(20),I.Receipt),'') Receipt, ";
query += " IsNull(I.PolicyNumber,'') PolicyNumber, ";
query += " IsNull(I.[Type],'') [Type], ";
query += " I.DateBilled, ";
query += " I.Amount, ";
query += " I.DatePaid, ";
query += " I.Paid, ";
query += " I.DoNotPay, ";
query += " I.WrongAmount, ";
query += " I.ID, ";
query += " IsNull(I.Notes,'') Notes ";
query += "From ";
query += " Invoice I ";
query += " Join Customer C On I.CustomerID = C.ID ";
switch (type)
{
case 'A':
query += "Where I.ID Is Not Null And I.CustomerID Is Not Null ";
break;
case 'C':
query += "Where I.CustomerID Is Null ";
break;
case 'N':
query += "Where I.DoNotPay = 1 And I.CustomerID Is Not Null ";
break;
case 'P':
query += "Where I.Paid = 1 And I.CustomerID Is Not Null ";
break;
case 'U':
query += "Where I.DoNotPay = 0 And I.Paid = 0 And I.CustomerID Is Not Null ";
break;
case 'W':
query += "Where I.WrongAmount = 1 And I.CustomerID Is Not Null ";
break;
}
query += "Order By ";
query += " I.DateBilled ";
adapter = new SqlDataAdapter(query, conn);
invoices = new DataTable();
adapter.Fill(invoices);
// Link the data table to the grid
dgvInvoices.DataSource = invoices;
dgvInvoices.Columns[0].DataPropertyName = "CustomerName";
dgvInvoices.Columns[0].ReadOnly = true;
dgvInvoices.Columns[1].DataPropertyName = "Contract";
dgvInvoices.Columns[1].ReadOnly = true;
dgvInvoices.Columns[2].DataPropertyName = "Receipt";
dgvInvoices.Columns[2].ReadOnly = true;
dgvInvoices.Columns[3].DataPropertyName = "PolicyNumber";
dgvInvoices.Columns[3].ReadOnly = true;
dgvInvoices.Columns[4].DataPropertyName = "PolicyNumber";
dgvInvoices.Columns[4].ReadOnly = true;
dgvInvoices.Columns[5].DataPropertyName = "DateBilled";
dgvInvoices.Columns[5].ReadOnly = true;
dgvInvoices.Columns[6].DataPropertyName = "Amount";
dgvInvoices.Columns[6].DefaultCellStyle.Format = "c";
dgvInvoices.Columns[7].DataPropertyName = "DatePaid";
dgvInvoices.Columns[8].DataPropertyName = "Paid";
dgvInvoices.Columns[9].DataPropertyName = "DoNotPay";
dgvInvoices.Columns[10].DataPropertyName = "WrongAmount";
dgvInvoices.Columns[11].DataPropertyName = "ID";
dgvInvoices.Columns[11].Visible = false;
dgvInvoices.Columns[12].DataPropertyName = "Notes";
dgvInvoices.Columns[12].Visible = false;
// Close the database connection
conn.Close();
// Calculate totals
CalculateTotals();
}
// This function resets all of the fields
private void ResetFields()
{
// Turn on the ignore change flag
ignoreChange = true;
// Reset actions
cbDoNotPay.Checked = false;
cbPaid.Checked = false;
cbWrongAmt.Checked = false;
// Reset filter fields
dpMinDateBilled.Text = "1/1/1900";
dpMaxDateBilled.Text = "12/31/2099";
dpMinDatePaid.Text = "1/1/1900";
dpMaxDatePaid.Text = "12/31/2099";
tbContract.Text = "";
tbName.Text = "";
tbPolicy.Text = "";
tbReceipt.Text = "";
// Turn off the ignore change flag
ignoreChange = false;
}
// This function saves the row to the database
private void Save(DataRow row)
{
// Format values as needed
Double amount = Double.Parse(row["Amount"].ToString());
Int32 receipt;
try
{
receipt = Int32.Parse(row["Receipt"].ToString());
}
catch
{
receipt = 0;
}
// Acquire a connection to the database
SqlConnection conn = new SqlConnection("Data Source=REPORTSERVER;Initial Catalog=Insurance;Integrated Security=True");
conn.Open();
// Save the customer to the database
SqlCommand cmd = new SqlCommand("usp_SaveInvoice", conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add("@InvoiceID", SqlDbType.Int).Value = row["ID"];
if (receipt != 0)
{
cmd.Parameters.Add("@Receipt", SqlDbType.Int).Value = row["Receipt"];
}
else
{
cmd.Parameters.Add("@Receipt", SqlDbType.Int).Value = DBNull.Value;
}
cmd.Parameters.Add("@Type", SqlDbType.VarChar, 10).Value = row["Type"];
cmd.Parameters.Add("@Policy", SqlDbType.VarChar, 15).Value = row["PolicyNumber"];
cmd.Parameters.Add("@DateBilled", SqlDbType.Date).Value = DateTime.Parse(row["DateBilled"].ToString());
cmd.Parameters.Add("@Amount", SqlDbType.Money).Value = amount;
if (row["DatePaid"].ToString().Equals(""))
{
cmd.Parameters.Add("@DatePaid", SqlDbType.Date).Value = DBNull.Value;
}
else
{
cmd.Parameters.Add("@DatePaid", SqlDbType.Date).Value = DateTime.Parse(row["DatePaid"].ToString());
}
cmd.Parameters.Add("@Paid", SqlDbType.Bit).Value = row["Paid"];
cmd.Parameters.Add("@DoNotPay", SqlDbType.Bit).Value = row["DoNotPay"];
cmd.Parameters.Add("@WrongAmount", SqlDbType.Bit).Value = row["WrongAmount"];
cmd.Parameters.Add("@Notes", SqlDbType.VarChar, 200000000).Value = row["Notes"];
cmd.Parameters.Add("@UserName", SqlDbType.VarChar, 100).Value = Environment.UserName;
cmd.ExecuteNonQuery();
cmd.Dispose();
// Close the connection to the database
conn.Close();
conn.Dispose();
}
// This function goes through the rows and saves each one to the database
private Boolean SaveRows()
{
// Initialize the return variable
Boolean returnVal = true;
// Change the grid focus to end any edits so they are committed to the datatable
dgvInvoices.CurrentCell = null;
// Loop through each row in the data table and validate it
foreach (DataRow row in invoices.Rows)
{
if (returnVal == false)
{
continue;
}
else
{
// If the row has changed, validate changes
if (row.RowState == DataRowState.Modified)
{
returnVal = Validate(row);
}
}
}
// Loop through each row in the data table and save it
if (returnVal)
{
// Loop through each row in the data table
foreach (DataRow row in invoices.Rows)
{
// If the row has changed, save changes
if (row.RowState == DataRowState.Modified)
{
Save(row);
}
}
}
if (returnVal)
{
MessageBox.Show("Database updated!");
LoadInvoices();
}
// Return value
return returnVal;
}
// This function validates the data row to make sure it can be saved to the database
private Boolean Validate(DataRow row)
{
// Validate date received
DateTime dateBilled;
try
{
dateBilled = DateTime.Parse(row["DateBilled"].ToString());
}
catch
{
MessageBox.Show("Date received is incorrect");
return false;
}
if (dateBilled < DateTime.Parse("1/1/2010"))
{
MessageBox.Show("Date received must be on or after 1/1/2010");
return false;
}
// Validate date paid
DateTime datePaid;
if (!row["DatePaid"].ToString().Trim().Equals(""))
{
try
{
datePaid = DateTime.Parse(row["DatePaid"].ToString());
}
catch
{
MessageBox.Show("Date paid is incorrect");
return false;
}
if (datePaid < dateBilled)
{
MessageBox.Show("Date paid must be on or after date received");
return false;
}
}
// Validate amount
Double amount;
try
{
amount = Double.Parse(row["Amount"].ToString());
}
catch
{
MessageBox.Show("Amount is incorrect");
return false;
}
if (amount <= 0)
{
MessageBox.Show("Amount must be positive");
return false;
}
// Return true
return true;
}
#endregion
#region Window Events
// This function marks the column as checked
private void CheckColumn(String columnName, Boolean checkState)
{
// Turn on the ignore change flag to prevent recalculating totals for each row
ignoreChange = true;
// Loop through each row in the displayable grid
foreach (DataRowView viewRow in invoices.DefaultView)
{
DataRow row = viewRow.Row;
row[columnName] = checkState;
if ((columnName == "Paid") && (checkState == true))
{
row["DoNotPay"] = false;
}
if ((columnName == "DoNotPay") && (checkState == true))
{
row["Paid"] = false;
}
}
// Turn off the ignore change flag
ignoreChange = false;
// Recalculate the totals
CalculateTotals();
// Refresh the grid
dgvInvoices.Refresh();
}
// This function is used to limit the characters input in a date box
private void Date_KeyPress(object sender, KeyPressEventArgs e)
{
if (("/0123456789".Contains(e.KeyChar)) || ((Int32)e.KeyChar == 8))
{
e.Handled = false;
}
else
{
e.Handled = true;
}
}
// This function is called when filters update
private void FilterTextChanged(object sender, EventArgs e)
{
// Build the filter
if (!ignoreChange)
{
String filter = "";
filter += "CustomerName Like '%" + tbName.Text.Replace("'", "''") + "%' ";
filter += "And [Contract] Like '%" + tbContract.Text.Replace("'", "''") + "%' ";
filter += "And PolicyNumber Like '%" + tbPolicy.Text.Replace("'", "''") + "%' ";
filter += "And Convert(Receipt,System.String) Like '%" + tbReceipt.Text.Replace("'", "''") + "%' ";
filter += "And IsNull(DateBilled,'1/1/1900') >= '" + dpMinDateBilled.Text + "' ";
filter += "And IsNull(DateBilled,'1/1/1900') <= '" + dpMaxDateBilled.Text + "' ";
filter += "And IsNull(DatePaid,'1/1/1900') >= '" + dpMinDatePaid.Text + "' ";
filter += "And IsNull(DatePaid,'1/1/1900') <= '" + dpMaxDatePaid.Text + "' ";
// Apply the filter to the table
invoices.DefaultView.RowFilter = filter;
// Calculate totals
CalculateTotals();
}
}
// This function is called when the form is closing
private void InvoiceEditor_FormClosing(object sender, FormClosingEventArgs e)
{
// By default, assume not closing
e.Cancel = false;
// Check if changes have been made
Boolean changed = false;
foreach (DataRow row in invoices.Rows)
{
if (changed)
{
continue;
}
else
{
if (row.RowState == DataRowState.Modified)
{
changed = true;
}
}
}
// If changes were made, ask the user if they want to save changes
if (changed == true)
{
// Ask the customer if they want to save changes
DialogResult choice = MessageBox.Show("Changes have been made to invoices. Do you want to save them?", "Save Changes", MessageBoxButtons.YesNoCancel);
if (choice == DialogResult.Yes)
{
e.Cancel = !SaveRows();
}
else if (choice == DialogResult.Cancel)
{
e.Cancel = true;
}
}
}
// This function is called when the form is loading
private void InvoiceEditor_Load(object sender, EventArgs e)
{
// Set the window fields to defaults
ResetFields();
// Load invoices
LoadInvoices();
// Set the window header
switch (type)
{
case 'A':
this.Text = "All Invoices";
break;
case 'C':
this.Text = "Invoices w/o Customers";
break;
case 'N':
this.Text = "Do Not Pay Invoices";
break;
case 'P':
this.Text = "Paid Invoices";
break;
case 'U':
this.Text = "Unpaid Invoices";
break;
case 'W':
this.Text = "Wrong Amount Invoices";
break;
}
}
// This function is called when the Do Not Pay flag is clicked
private void cbDoNotPay_CheckedChanged(object sender, EventArgs e)
{
// If the user checked the box, check all of the rows in the grid
if (!ignoreChange)
{
CheckColumn("DoNotPay", cbDoNotPay.Checked);
}
}
// This functions is called when the Paid flag is clicked
private void cbPaid_CheckedChanged(object sender, EventArgs e)
{
// If the user checked the box, check all of the rows in the grid
if (!ignoreChange)
{
CheckColumn("Paid", cbPaid.Checked);
}
}
// This function is called when the Wrong Amount flag is clicked
private void cbWrongAmt_CheckedChanged(object sender, EventArgs e)
{
// If the user checked the box, check all of the rows in the grid
if (!ignoreChange)
{
CheckColumn("WrongAmount", cbWrongAmt.Checked);
}
}
// This function is called when the cell value changes
private void dgvInvoices_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
// If one of the flag changes, recalculate the totals
if ((!ignoreChange) && (" 8 9 10 ".Contains(e.ColumnIndex.ToString())))
{
// Change focus to end the edit
dgvInvoices.CurrentCell = dgvInvoices.Rows[e.RowIndex].Cells[0];
// If the paid flag changes, flip the other one
if ((e.ColumnIndex == 8) && (Boolean.Parse(dgvInvoices.Rows[e.RowIndex].Cells[8].Value.ToString()) == true))
{
dgvInvoices.Rows[e.RowIndex].Cells[9].Value = false;
}
// If the do not pay flag changes, flip the other one
if ((e.ColumnIndex == 9) && (Boolean.Parse(dgvInvoices.Rows[e.RowIndex].Cells[9].Value.ToString()) == true))
{
dgvInvoices.Rows[e.RowIndex].Cells[8].Value = false;
}
dgvInvoices.Refresh();
CalculateTotals();
}
}
// This function is called when a row in grid is double clicked
private void dgvInvoices_DoubleClick(object sender, EventArgs e)
{
// Get the selected row
DataRowView row = (DataRowView)dgvInvoices.BindingContext[invoices].Current;
Int32 InvoiceID;
try
{
InvoiceID = Int32.Parse(row["ID"].ToString().Trim());
}
catch
{
InvoiceID = 0;
}
// Ensure a row was selected
if (InvoiceID != 0)
{
// Display the window for editing this invoice
Invoice inv = new Invoice(InvoiceID,row["CustomerName"].ToString());
inv.ShowDialog(this.MdiParent);
}
}
#endregion
#region Menu Items
// This function is called when the close button is clicked on the menu
private void closeToolStripMenuItem_Click(object sender, EventArgs e)
{
// Close the form
this.Close();
}
// This function is called when the save button is clicked on the menu
private void saveToolStripMenuItem_Click(object sender, EventArgs e)
{
// Call the save method
SaveRows();
}
// This function is called when the undo button is clicked on the menu
private void undoToolStripMenuItem_Click(object sender, EventArgs e)
{
// Reset filters
ResetFields();
// Reload the grid
LoadInvoices();
}
#endregion
}
}
答案 0 :(得分：1)
我会将您的发票数据加载到DataTable中。
您可以使用绑定源并将其数据源设置为DataTable的数据源。如果您正在使用DataGridView，那么请将此对象的数据源设置为绑定源。
执行此操作意味着您只需要在内存中对DataTable执行过滤，所有更改都将自动波及到您的DataGridView。
您可以使用DataView轻松地在DataTable上执行过滤器。
希望这有帮助。
答案 1 :(得分：0)
在数据绑定事件期间。有一个Event参数包含要绑定的数据...您可以在此参数中设置值，它将自动设置为dataGridView