Add startCell parameter to ConverterToPrompt for enhanced Excel data processing

Utils/Excel2Prompt.cs

@@ -12,8 +12,9 @@ public class Excel2Prompt
     /// </summary>
     /// <param name="excelData"></param>
     /// <param name="columns"></param>
+    /// <param name="startCell">A</param>
     /// <returns></returns>
-    public static string ConverterToPrompt(IEnumerable<dynamic> excelData, IEnumerable<string> columns)
+    public static string ConverterToPrompt(IEnumerable<dynamic> excelData, IEnumerable<string> columns, string startCell)
     {
         /*
         示例:
@@ -36,11 +37,18 @@ public class Excel2Prompt
                 - Missing values: 7007
         */
         var prompts = new List<string>();
-        prompts.Add("This Excel file contains the following columns:" );
+        prompts.Add("This Excel file contains the following columns:");
         var dataList = excelData.ToList();
 
+        // 解析 startCell，获取起始列的索引
+        int startColumnIndex = GetColumnIndexFromCell(startCell);
+
+        int columnIndex = startColumnIndex;
         foreach (var column in columns)
         {
+            columnIndex++;
+            string columnLetter = GetExcelColumnName(columnIndex);
+
             var columnData = dataList.Select(row =>
             {
                 var rowDict = (IDictionary<string, object>)row;
@@ -50,23 +58,50 @@ public class Excel2Prompt
             var nonNullData = columnData.Where(value => value != null).ToList();
             var missingValues = columnData.Count - nonNullData.Count;
             var uniqueValues = nonNullData.Distinct().Count();
-            var sampleValues = nonNullData.Take(3).Select(value => value.ToString().Replace("\n"," ")).ToArray();
+            var sampleValues = nonNullData.Take(3).Select(value => value.ToString().Replace("\n", " ")).ToArray();
 
             // 自动识别数据类型
             var dataType = GetColumnDataType(nonNullData);
 
-            var prompt = $"- Column '{column.Replace("\n", " ")}'\n" +
-                            $"    - Type: {dataType}\n" +
-                            $"    - Sample values: ['{string.Join("', '", sampleValues)}']";
-                            //$"    - Unique values: {uniqueValues}\n" +
-                            //$"    - Missing values: {missingValues}\n";
-
+            var prompt = $"- Column '{column.Replace("\n", " ")}' (Excel Column {columnLetter})\n" +
+                         $"    - Type: {dataType}\n" +
+                         $"    - Sample values: ['{string.Join("', '", sampleValues)}']";
             prompts.Add(prompt);
         }
 
         return string.Join(Environment.NewLine + Environment.NewLine, prompts);
     }
 
+    private static int GetColumnIndexFromCell(string cell)
+    {
+        // 提取列部分
+        string columnPart = new string(cell.Where(char.IsLetter).ToArray());
+        int columnIndex = 0;
+        int factor = 1;
+
+        for (int i = columnPart.Length - 1; i >= 0; i--)
+        {
+            columnIndex += (columnPart[i] - 'A' + 1) * factor;
+            factor *= 26;
+        }
+        // 最终结果需要包含StartCell
+        return columnIndex - 1;
+    }
+
+    private static string GetExcelColumnName(int columnNumber)
+    {
+        int dividend = columnNumber;
+        string columnName = string.Empty;
+
+        while (dividend > 0)
+        {
+            int modulo = (dividend - 1) % 26;
+            columnName = Convert.ToChar(65 + modulo) + columnName;
+            dividend = (dividend - modulo) / 26;
+        }
+
+        return columnName;
+    }
 
     private static string GetColumnDataType(List<object> data)
     {

Views/ViewModels/ImportViewModel.cs

@@ -84,7 +84,7 @@ public partial class ImportViewModel : ObservableRecipient, IViewModel
             }
             MaxRow = ExcelData.Count();
 
-            PromptString = Excel2Prompt.ConverterToPrompt(ExcelData, columns);
+            PromptString = Excel2Prompt.ConverterToPrompt(ExcelData, columns,StartCell);
         }
         catch (Exception ex)
         {