修复BtnSaveTempDiff_Click方法中的键名不匹配问题，解决KeyNotFoundException异常

Windows/CS/Framework4.0/Toprie/Toprie/Setting.cs

@@ -4124,7 +4124,7 @@ namespace JoyD.Windows.CS
                 {
                     Filter = "CSV文件 (*.csv)|*.csv|所有文件 (*.*)|*.*",
                     Title = "保存温差图例和温度数据",
-                    FileName = $"温差数据_{DateTime.Now:yyyyMMdd_HHmmss}.csv"
+                    FileName = $"温差数据.csv"
                 };
 
                 if (saveFileDialog.ShowDialog() == DialogResult.OK)
@@ -4138,8 +4138,10 @@ namespace JoyD.Windows.CS
                         // 保存温差图例列表中的所有温差图例信息
                         foreach (var item in tempDiffData)
                         {
-                            double temperature = Convert.ToDouble(item["Temperature"]);
-                            Color color = (Color)item["Color"];
+                            // 获取温差值并去除°C符号进行转换
+                            string tempString = item["tempDiffValue"].ToString().Replace("°C", "").Trim();
+                            double temperature = Convert.ToDouble(tempString);
+                            Color color = (Color)item["color"];
                             string colorHex = $"#{color.R:X2}{color.G:X2}{color.B:X2}";
                             writer.WriteLine($"{temperature:F1},{colorHex}");
                         }