devexpress/agent-skills/devexpress-reports-core

using DevExpress.XtraReports.UI;
 
var report = new XtraReport {
    DataSource = GetProducts(), // IList, DataTable, etc.
    Name = "ProductReport"
};
 
var detail = new DetailBand();
report.Bands.Add(detail);
detail.HeightF = 30;
 
var nameLabel = new XRLabel();
detail.Controls.Add(nameLabel);
nameLabel.BoundsF = new RectangleF(0, 0, 200, 25);
nameLabel.ExpressionBindings.Add(new ExpressionBinding("BeforePrint", "Text", "[ProductName]"));
 
// Export
report.ExportToPdf("output.pdf");

// To file path
report.ExportToPdf("report.pdf");
report.ExportToXlsx("report.xlsx");
report.ExportToDocx("report.docx");
report.ExportToCsv("report.csv");
report.ExportToHtml("report.html");
report.ExportToImage("report.png");
report.ExportToRtf("report.rtf");
report.ExportToText("report.txt");
report.ExportToXls("report.xls");
report.ExportToMht("report.mht");
 
// To stream (preferred for web/API scenarios)
using var ms = new MemoryStream();
report.ExportToPdf(ms);
 
// Async (required in web apps)
await report.ExportToPdfAsync(ms);

var pdfOptions = new DevExpress.XtraPrinting.PdfExportOptions {
    PageRange = "1-3",
    PdfACompatibility = DevExpress.XtraPrinting.PdfACompatibility.PdfA2b
};
report.ExportToPdf("report.pdf", pdfOptions);

report.DataSource = myList;       // IList, DataTable, or DevExpress data source
report.DataMember = "Orders";     // Table name (for DataSet) or empty for simple list

// Specify an expression that calculates total value from UnitPrice and UnitsInStock fields.
label.ExpressionBindings.Add(new ExpressionBinding("BeforePrint", "Text", "[UnitPrice]*[UnitsInStock]"));
// Specify an expression that is rendered within the PrintOnPage event.
label.ExpressionBindings.Add(new ExpressionBinding("PrintOnPage", "Text", "'Printed'"));

// Create a date report parameter.
// Use an expression to specify the parameter's default value.
var dateParameter = new Parameter() {
    Name = "date",
    Description = "Date:",
    Type = typeof(System.DateTime),
    ExpressionBindings = { new BasicExpressionBinding("Value", "Now()") }
};
// Add the parameter to the report's Parameters collection.
report.Parameters.Add(dateParameter);
// Create a label and bind the label's Text property to the parameter value.
// Use the parameter's name to reference the parameter in the label's expression.
var dateLabel = new XRLabel();
report.Bands[BandKind.Detail].Controls.Add(dateLabel);
dateLabel.BoundsF = new RectangleF(0, 0, 200, 50);
dateLabel.ExpressionBindings.Add(new ExpressionBinding("BeforePrint", "Text", "?date"));
// Use the parameter in the report filter if needed: 
report.FilterString = "[OrderDate] >= ?date";

report.SaveLayoutToXml("layout.repx");  // .repx = XML serialization
 
var loaded = XtraReport.FromXmlFile("layout.repx");

report.CreateDocument();           // sync — OK in desktop apps
// OR in web:
await report.CreateDocumentAsync();
report.ExportToPdf(outputStream);

var table = new XRTable();
detail.Controls.Add(table);
table.BeginInit();
var row = new XRTableRow();
table.Rows.Add(row);
var nameCell = new XRTableCell { WidthF = 450 };  // absolute column width in pixels
var priceCell = new XRTableCell { WidthF = 200 };  // 450 + 200 = 650 (equals table SizeF.Width)
row.Cells.Add(nameCell);
row.Cells.Add(priceCell);
nameCell.ExpressionBindings.Add(new ExpressionBinding("BeforePrint", "Text", "[ProductName]"));
priceCell.ExpressionBindings.Add(new ExpressionBinding("BeforePrint", "Text", "[UnitPrice]"));
table.SizeF = new SizeF(650, 25);  // total width = sum of cell WidthF values
table.EndInit();
// See references/report-controls.md for the full XRTable reference.

// Pattern A — XRSummary.Func + FormatString (simplest for standard aggregates):
var countLabel = new XRLabel();
groupFooter.Controls.Add(countLabel);
countLabel.BoundsF = new RectangleF(0, 0, 200, 25);
countLabel.Summary = new XRSummary {
    Func = SummaryFunc.Count,        // .Sum, .Avg, .Max, .Min, .Count, etc.
    Running = SummaryRunning.Group,  // .Page / .Report
    FormatString = "Count: {0}"      // {0} is replaced by the calculated value
};
 
// Pattern B — XRSummary.Running + ExpressionBinding with sum*() for computed expressions:
var totalLabel = new XRLabel();
groupFooter.Controls.Add(totalLabel);
totalLabel.BoundsF = new RectangleF(0, 0, 200, 25);
totalLabel.Summary = new XRSummary { Running = SummaryRunning.Group };
totalLabel.ExpressionBindings.Add(new ExpressionBinding("BeforePrint", "Text", "sumSum([Price])"));
// Other sum*() functions: sumAvg([Field]), sumCount(), sumSum([Field]), sumMin([Field])
// See references/expressions.md for the full Summary Functions reference.

// Set Margins first, then compute availableWidth once and reuse it across all bands.
Margins = new DevExpress.Drawing.DXMargins(50, 50, 50, 50); // Left, Right, Top, Bottom
var availableWidth = PageWidthF - Margins.Left - Margins.Right;
 
// Single control filling the full band width:
label.BoundsF = new RectangleF(0, 0, availableWidth, 25);
table.SizeF   = new SizeF(availableWidth, 25);
 
// Multi-column table — proportional fractions of availableWidth:
cell1.WidthF = availableWidth * 0.67f;
cell2.WidthF = availableWidth * 0.33f;
// Rule: cell1.WidthF + cell2.WidthF must equal table.SizeF.Width exactly.