0
我需要我的應用程序幫助，我的應用程序中的所有內容都能正常工作，但我想添加最後一個幫助用戶的細節使用應用程序。如何在將數據加載到DataGridView的同時將數據加載1到100％完成加載時
我有一個combobox，有三個選擇用戶將使用，每個選擇有不同的倉庫數據庫環境。所以如果他們在組合框倉庫1中選擇，然後將數據庫1表數據加載到datagridview，但是當他們選擇應用程序正在加載顯示數據時，所以何時這樣做取決於有多少數據有時需要5到15秒來加載或更多我想添加一個進度條，讓用戶知道要等到進度達到100％。
所以我需要幫助，如何使進度條在datagridview加載數據時工作。如果您需要更多信息，請讓我知道。
後的變化，請檢查一下，但我得到一個錯誤 [！[在這裏輸入的形象描述] [1] [1]
更新的代碼：// 全局變量 // datagridview，bindingsource，data_apapter全局對象變量 private DataGridView dataGridView = new DataGridView（）; private BindingSource bindingSource = new BindingSource（）; private SqlDataAdapter dataAdapter = new SqlDataAdapter（）;
//class objects
Databases lemars = new Databases();
Databases schuyler = new Databases();
Databases detroitlakeskc = new Databases();
/*
* The GetLeMarsConnectionDatabaseConnection method starts the database string connection for warehouse LeMars21St
*/
private void GetLeMarsConnectionDatabaseConnection(string selectCommand, Databases database)
{
try
{
//Create the connection string, data adapter and data table.
String connectionString = database.LeMarsConnectionString;
// Specify a connection string. Replace the given value with a
// valid connection string for a Northwind SQL Server sample
// database accessible to your system.
// Create a new data adapter based on the specified query.
dataAdapter = new SqlDataAdapter(selectCommand, connectionString);
// Create a command builder to generate SQL update, insert, and
// delete commands based on selectCommand. These are used to
// update the database.
SqlCommandBuilder commandBuilder = new SqlCommandBuilder(dataAdapter);
// Populate a new data table and bind it to the BindingSource.
System.Data.DataTable table = new System.Data.DataTable();
table.Locale = System.Globalization.CultureInfo.InvariantCulture;
dataAdapter.Fill(table);
bindingSource.DataSource = table;
// Resize the DataGridView columns to fit the newly loaded content.
dataGridView_ShowAllData.AutoResizeColumns(DataGridViewAutoSizeColumnsMode.AllCellsExceptHeader);
}
//catch the error if cannot get a database connection
catch (SqlException)
{
MessageBox.Show("FootPrint-LEMARS Database couldn't received a connection ***ERROR***");
}
}
private void cmb_DatabaseSelection_SelectedIndexChanged(object sender, EventArgs e)
{
//Boolean selection statements to Fill the DataGridView based on the user selecction
if (cmb_DatabaseSelection.SelectedItem == "LeMars21St")
{
dataGridView_ShowAllData.DataSource = bindingSource;
//query with 11 columns
GetLeMarsConnectionDatabaseConnection("Select * from dbo.AllInvoicesInReadyStatus", lemars);
}
private void bgnWorker_LoadingForm_DoWork(object sender, DoWorkEventArgs e)
{
// TODO: query your database
// for easier reading I assume that your query-result has only one column
//string query = @"Select * from dbo.AllInvoicesInReadyStatus";
//** did you strip your sql-execution-code? have a look at https://msdn.microsoft.com/de-de/library/system.data.sqlclient.sqlcommand.aspx
var queryResult = new List<object>();
bgnWorker_LoadingForm.ReportProgress(10);
var table = new System.Data.DataTable();
// TODO: create matching columns for your query-result in the datatable
// https://msdn.microsoft.com/de-de/library/system.data.datatable.newrow(v=vs.110).aspx
// Create new DataTable and DataSource objects.
// Declare DataColumn and DataRow variables.
DataColumn column;
DataRow row;
DataView view;
// Create new DataColumn, set DataType, ColumnName, and add to DataTable.
column = new DataColumn();
column.DataType = typeof(string);
column.ColumnName = "invoice";
table.Columns.Add(column);
// Create second column.
column = new DataColumn();
column.DataType = typeof(string);
column.ColumnName = "shipment";
table.Columns.Add(column);
// Create third column.
column = new DataColumn();
column.DataType = typeof(string);
column.ColumnName = "Project";
table.Columns.Add(column);
// Create fourth column.
column = new DataColumn();
column.DataType = typeof(DateTime);
column.ColumnName = "invoiceDateTB";
table.Columns.Add(column);
// Create fifth column.
column = new DataColumn();
column.DataType = typeof(DateTime);
column.ColumnName = "CreatedDate";
table.Columns.Add(column);
// Create sixth column.
column = new DataColumn();
column.DataType = typeof(string);
column.ColumnName = "typeName";
table.Columns.Add(column);
// Create seventh column.
column = new DataColumn();
column.DataType = typeof(string);
column.ColumnName = "statusName";
table.Columns.Add(column);
// Create eighth column.
column = new DataColumn();
column.DataType = typeof(decimal);
column.ColumnName = "total";
table.Columns.Add(column);
// Create ninth column.
column = new DataColumn();
column.DataType = typeof(string);
column.ColumnName = "import_status";
table.Columns.Add(column);
// Create tenth column.
column = new DataColumn();
column.DataType = typeof(DateTime);
column.ColumnName = "Time_Completed";
table.Columns.Add(column);
// Create eleventh column.
column = new DataColumn();
column.DataType = typeof(string);
column.ColumnName = "ERROR_DESCRIPTION";
table.Columns.Add(column);
for (var i = 0; i < queryResult.Count; i++)
{
var progress = 10 + (int)((float)i/queryResult.Count) * 90;
bgnWorker_LoadingForm.ReportProgress(progress);
//** dont know whats going on here
//** but normally you should iterate your data-reader here and transfer the data of your query result to the created row... like this: https://msdn.microsoft.com/de-de/library/haa3afyz(v=vs.110).aspx
row = table.NewRow();
row["invoice"].ToString();
row["shipment"].ToString();
row["Project"].ToString();
row["invoiceDateTB"] = typeof(DateTime);
row["CreatedDate"] = typeof(DateTime);
row["typeName"].ToString();
row["statusName"].ToString();
row["total"] = typeof(decimal);
row["import_status"].ToString();
row["Time_Completed"] = typeof(DateTime);
row["ERROR_DESCRIPTION"].ToString();
table.Rows.Add(row);
// TODO: add the row data to the table
// same link as before: https://msdn.microsoft.com/de-de/library/system.data.datatable.newrow(v=vs.110).aspx
}
//**begin: move this stuff to worker completed
// Create a DataView using the DataTable. .
view = new DataView(table);
//**end
// Set a DataGrid control's DataSource to the DataView.
dataGridView_ShowAllData.DataSource = view;
e.Result = table;
}
private void bgnWorker_LoadingForm_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
System.Data.DataTable table = (System.Data.DataTable)e.Result;
// TODO: Check for errors
// TODO: Assign the table to your grid
// TODO: unlock your ui, hide progress dialog
}
private void bgnWorker_LoadingForm_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
// TODO: update your progress dialog/progressbar, f.e.
prgBar_DataGridViewLoading.Value = e.ProgressPercentage;
}
private void button1_Click(object sender, EventArgs e)
{
if (bgnWorker_LoadingForm.IsBusy) return;
bgnWorker_LoadingForm.RunWorkerAsync();
// TODO: lock your ui, show progress dialog or progressbar...
}
你不能做到這一點與填充的方法，因爲你沒有在迴路中的任何控制。您將不得不調整您的查詢和代碼以獲取記錄計數，然後循環遍歷記錄以使用單獨的線程填充表。或者只是將進度條設置爲一種標誌樣式。 – LarsTech
我明白了，你可以顯示例如有控制填充datadridview或進度條勞斯萊斯風格 – AndresBryan29
'progressBar1.Style = ProgressBarStyle.Marquee時;' – LarsTech