I have a Janus GridEX and I want to add a DropDownList with images and text to a column. When I populate the ValueList of the column I pass a DataView as parameter which contain a DataTable structured in this way:
var dt = new DataTable("asd");
dt.Columns.Add("value");
dt.Columns.Add("text");
dt.Columns.Add("img", typeof(byte[]));
then I add a row which contains one row:
var row2 = dt.NewRow();
row2["value"] = 1;
row2["text"] = "A2";
row["img"] = GetBytesFromImage(resources.Icon1);
this is the GetBytesFromImage routine:
private byte[] GetBytesFromImage(Icon ico)
{
using(var ms = new MemoryStream())
{
ico.Save(ms);
return ms.ToArray()
}
}
then I populate the valuelist:
grid.......PopulateValueList(dataview, "value","text","img",Color.Red, new Size(16,16)
then I get the error. Someone know why?
Related
I have this project on c# windows forms and what I have to do is get some data from a web service and present them to FastRaport.
I have tried display them on a DataGridView first and then fetching the data from it and it works pretty nice. I can download the file and then it gives me a dialog asking me in what format do I want to save it.
But now the requirement is to not use gridview at all, just a button that would convert directly those data into a PDF file.
Here's my code for displaying the data into DataGridView:
var asd1 = dataGridView1.Columns.Add("DrzavaAng", "DrzavaAng");
var asd2 = dataGridView1.Columns.Add("Valuta", "Valuta");
var asd3 = dataGridView1.Columns.Add("Oznaka", "Oznaka");
var asd4 = dataGridView1.Columns.Add("Nomin", "Nomin");
var asd5 = dataGridView1.Columns.Add("Sreden", "Sreden");
for (var i = 0; i<xmlNodes.Count; i++)
{
var node = xmlNodes[i];
var states = new Class();
states.Valuta = node["Valuta"].InnerText;
states.Oznaka = node["Oznaka"].InnerText;
states.Nomin = node["Nomin"].InnerText;
states.Sreden = node["Sreden"].InnerText;
states.DrzavaAng = node["DrzavaAng"].InnerText;
//var asd = dataGridView1.Columns.Add("1", "1");
_ = dataGridView1.Rows.Add();
dataGridView1.Rows[i].Cells["DrzavaAng"].Value=states.DrzavaAng;
dataGridView1.Rows[i].Cells["Valuta"].Value=states.Valuta;
dataGridView1.Rows[i].Cells["Oznaka"].Value=states.Oznaka;
dataGridView1.Rows[i].Cells["Nomin"].Value=states.Nomin;
dataGridView1.Rows[i].Cells["Sreden"].Value=states.Sreden;
}
Here's the part where I pass the data from GridView to the FastReport "database".
using (Report report = new Report())
{
report.Load(ReportPath);
DataTable dt = new DataTable();
foreach (DataGridViewColumn cl in dataGridView1.Columns)
{
dt.Columns.Add();
}
object[] clvl = new object[dataGridView1.Columns.Count];
foreach (DataGridViewRow row in dataGridView1.Rows)
{
for (int i = 0; i<row.Cells.Count; i++)
{ clvl[i] = row.Cells[i].Value; }
dt.Rows.Add(clvl);
}
DataSet ds = new DataSet();
ds.Tables.Add(dt);
report.Dictionary.RegisterData(ds.Tables[0], "test", true);
report.SetParameterValue("date", dateTimePicker1.Value.ToString("dd.MM.yyyy"));
report.Show();
}
Here's my FastReport file before committing anything:
FastReportImage
And here's the output I get : FastReport output
My question is, how can I make it to fetch the data without the gridview, directly from webservice and load it into a FastReport -> PDF file?
What's the equivalent in .NET to convert my DataGrid to a DataTable (DataGrid.ItemsSource isn't defined in .Net csharp.
Thanks!
DataTable dt = new DataTable();
dt = ((DataView)DataGrid1.ItemsSource).ToTable();
EDIT
This isn't a duplicate since the previous code is for WPF and I'm looking for an asp.net mvc csharp answer.
The ItemsSource is for WPF. Use the DataSource and cast it to DataTable like this:
dt = (DataTable)DataGrid1.DataSource;
EDIT: And if you get into trouble with above approach, you can use a custom method like this:
private DataTable ToDataTable(DataGridView dataGridView)
{
var dt = new DataTable();
foreach (DataGridViewColumn dataGridViewColumn in dataGridView.Columns)
{
if (dataGridViewColumn.Visible)
{
dt.Columns.Add();
}
}
var cell = new object[dataGridView.Columns.Count];
foreach (DataGridViewRow dataGridViewRow in dataGridView.Rows)
{
for (int i = 0; i < dataGridViewRow.Cells.Count; i++)
{
cell[i] = dataGridViewRow.Cells[i].Value;
}
dt.Rows.Add(cell);
}
return dt;
}
And then use it:
var dataTable = ToDataTable(dataGridView1);
Also MoreLinq is a good choice in case the type of Datasource is a list. Check this solution to know how to use it: https://stackoverflow.com/a/42550827/2946329
If you are referring to the System.Windows.Forms.DataGrid or System.Web.UI.WebControls.DataGrid, then the best way would be to cast the Datasource property to a DataTable.
Of course the Datasource property has to actually be a DataTable underlying type to begin with. You need to know the underlying type of the object stored in the Datasource property.
If the underlying type of Datasource is a generic list, then this SO post should help: How to convert a list into data table
FYI - The Windows Forms DataGrid control, according to Microsoft, has been replaced by the DataGridView.
if there is visible columns in datagridview you can use
private DataTable ToDataTable(DataGridView dataGridView)
{
var dt = new DataTable();
int columnCount = 0;
List<int> columnNumbers= new List<int>();
foreach (DataGridViewColumn dataGridViewColumn in dataGridView.Columns)
{
if (dataGridViewColumn.Visible)
{
dt.Columns.Add(dataGridViewColumn.Name);
columnNumbers.Add(columnCount);
}
columnCount++;
}
var cell = new object[columnNumbers.Count];
foreach (DataGridViewRow dataGridViewRow in dataGridView.Rows)
{
int i = 0;
foreach (int a in columnNumbers)
{
cell[i] = dataGridViewRow.Cells[a].Value;
i++;
}
dt.Rows.Add(cell);
}
return dt;
}
The custom method does not take into account the hidden columns. You are getting an error, because you have too many cells for the columns copied.
You can use :
int dgv1RowCount = dgv1.Rows.Count;
int numOfColumns = dgv1.Columns.GetColumnCount(DataGridViewElementStates.Visible) ;
int numCells = dgv1RowCount * numOfColumns;
// use numCells in the for loop
for (int i = 0; i < numOfCells ; i++)
{
enter code here
}
I bound my datatable to datagridview, every column shows the correct data. But on my Image Column in datagridview does not show the image, instead it shows System.Drawing.Bitmap string.
My codes are;
// I create the data column for my Image and add this to the datatable
DataColumn dc = new DataColumn("QR Code", typeof(Image));
dc.AllowDBNull = true;
dTable.Columns.Add(dc);
// I loop through all rows in datatable get the byte array of the image, and convert it to an Image
// And then add this image to the newly created column.
foreach (DataRow dr in dTable.Rows)
{
Image qrCode;
byte[] qrCodeBytes = (byte[])dr["StockQRCode"];
using(MemoryStream stream = new MemoryStream(qrCodeBytes))
{
qrCode = Image.FromStream(stream);
dr[dc] = qrCode;
}
}
// Bind my datatable to datagridview
List_ListContainer.DataSource = dTable;
What am I missing?
I am trying to learn how to join two data tables into one using Linq. My linq query is working correctly and I can see expected values in it. However, when I loop the linq results, and assign the values to a newly created data row and add that row to a new data table, the rows come out empty.
Here is my code:
private void btnCombine_Click(object sender, EventArgs e)
{
var innerJoinQuery =
from strRow in StrDataTable.AsEnumerable()
join intRow in IntDataTable.AsEnumerable()
on strRow.Field<int>("IntID") equals intRow.Field<int>("ID")
select new {
IntOne = intRow.Field<int>("FirstNum"),
IntTwo = intRow.Field<int>("SecondNum"),
StrOne = strRow.Field<string>("FirstStr"),
StrTwo = strRow.Field<string>("SecondStr"),
StrThree = strRow.Field<string>("SecondStr")
};
DataTable newTable = new DataTable();
newTable.Columns.Add("IntOne");
newTable.Columns.Add("IntTwo");
newTable.Columns.Add("FirstStr");
newTable.Columns.Add("SecondStr");
newTable.Columns.Add("ThirdStr");
newTable.Columns["IntOne"].DataType = System.Type.GetType("System.String");
newTable.Columns["IntTwo"].DataType = System.Type.GetType("System.String");
newTable.Columns["FirstStr"].DataType = System.Type.GetType("System.String");
newTable.Columns["SecondStr"].DataType = System.Type.GetType("System.String");
newTable.Columns["ThirdStr"].DataType = System.Type.GetType("System.String");
foreach (var row in innerJoinQuery)
{
DataRow rowToAdd = newTable.NewRow();
rowToAdd.ItemArray[0] = row.IntOne.ToString();
rowToAdd.ItemArray[1] = row.IntTwo.ToString();
rowToAdd.ItemArray[2] = row.StrOne.ToString();
rowToAdd.ItemArray[3] = row.StrTwo.ToString();
rowToAdd.ItemArray[4] = row.StrThree.ToString();
newTable.Rows.Add(rowToAdd);
}
dataGridView3.DataSource = newTable;
}
Using DataRow.ItemArray property with individual values doesn't work - instead, create the object[] array and then set the whole thing to the .ItemArray property. See this MSDN page for additional examples.
foreach (var row in innerJoinQuery)
{
DataRow rowToAdd = newTable.NewRow();
object[] items = new object[] {
row.IntOne.ToString(),
row.IntTwo.ToString(),
row.StrOne.ToString(),
row.StrTwo.ToString(),
row.StrThree.ToString()
};
rowToAdd.ItemArray = items;
newTable.Rows.Add(rowToAdd);
}
Alternately, use the DataRow indexer directly, which works with individual columns:
rowToAdd[0] = row.IntOne.ToString();
rowToAdd[1] = row.IntTwo.ToString();
rowToAdd[2] = row.StrOne.ToString();
rowToAdd[3] = row.StrTwo.ToString();
rowToAdd[4] = row.StrThree.ToString();
Additionally, when creating columns, there is a constructor that takes the type which can save you some code. Your first two column types are mismatched.
newTable.Columns.Add("IntOne", typeof(int));
newTable.Columns.Add("FirstStr", typeof(string));
The first two values appear to be Integers:
IntOne = intRow.Field<int>("FirstNum"),
IntTwo = intRow.Field<int>("SecondNum"),
But the DataType you assign the columns to is String:
newTable.Columns["IntOne"].DataType = System.Type.GetType("System.String");
newTable.Columns["IntTwo"].DataType = System.Type.GetType("System.String");
Update those to int's and see if that resolves it:
newTable.Columns["IntOne"].DataType = System.Type.GetType("System.Int32");
newTable.Columns["IntTwo"].DataType = System.Type.GetType("System.Int32");
rowToAdd.ItemArray[0] = row.IntOne;
rowToAdd.ItemArray[1] = row.IntTwo;
You may also need to supply the DataPropertyName for the columns:
newTable.Columns["IntOne"].DataPropertyName = "FirstNum";
newTable.Columns["IntTwo"].DataPropertyName = "SecondNum";
...
And ensure that the AutoGenerateColumns value is set to false
dataGridView3.AutoGenerateColumns = false;
Here is my code:
DataSet data = new DataSet();
data.ReadXml("data.xml");
DataGridView grid = new DataGridView();
var genreCboBoxItems = data.Tables[0].AsEnumerable().Select(genre => genre.Field<string>("genre")).Distinct().ToArray();
// TODO: Make is so the 'genre' column in grid is a combo box?
grid.DataSource = data.Tables[0];
grid.Dock = DockStyle.Fill;
this.Controls.Add(grid);
*edit: genreCboBoxItems
Try this: (not tested)
var column = new DataGridViewComboBoxColumn();
column.DataSource = data.Tables[0].AsEnumerable().
Select(genre => new { genre = genre.Field<string>("genre") }).Distinct();
column.DataPropertyName = "genre";
column.DisplayMember = "genre";
column.ValueMember = "genre";
grid.DataSource = data.Tables[0];
// Instead of the below line, You could use grid.Columns["genre"].Visible = false;
grid.Columns.Remove("genre");
grid.Columns.Add(column);
This might help you cast DataGridViewColumn to DataGridViewComboBox.
First create DataGridViewComboBoxColumn using designer with proper name. Then say you have a list of String list and other string values to bind to that datagridview then use this code:
Below code will bind a list to two DataGridViewTextBoxCell and a DataGridViewComboBoxCell. Note AllCriterias is a list with two string values and a list of string. DGVEligibilityCriteria is the grid name.
for (int i = 0; i < AllCriterias.Count; i++)
{
DataGridViewTextBoxCell Cmb1 = (DataGridViewTextBoxCell)DGVEligibilityCriteria.Rows[i].Cells[0];
Cmb1.Value = AllCriterias[i].Name;
DataGridViewTextBoxCell Cmb2 = (DataGridViewTextBoxCell)DGVEligibilityCriteria.Rows[i].Cells[1];
Cmb2.Value = AllCriterias[i].Type;
DataGridViewComboBoxCell Cmb = (DataGridViewComboBoxCell)DGVEligibilityCriteria.Rows[i].Cells[2];
foreach (var filtervalue in AllCriterias[i].FilterValues)
{
Cmb.Items.Add(filtervalue);
}
}
Need to display the fist index as default by setting selectindex property.
Use this code : Here "filterValues" is the name of the DataGridViewComboBoxCell which u created in the datagridview designer.
foreach (DataGridViewRow row in DGVEligibilityCriteria.Rows)
{
row.Cells["filterValues"].Value = (row.Cells["filterValues"] as DataGridViewComboBoxCell).Items[0];
}