基于System.Text导出

public void WriteTxt()
{
string ACellNameChecked = "";
string InSysInterAnalyReportWordSavePath;
ACellNameChecked = InvalidCellNameCharsRemoveForFilePath(AnalysisCellNamecomboBox.Text);
if (!Directory.Exists(InterferenceAnalysisResultSavePath + "\各小区优化方案报告"))
Directory.CreateDirectory(InterferenceAnalysisResultSavePath + "\各小区优化方案报告");
InSysInterAnalyReportWordSavePath = InterferenceAnalysisResultSavePath + "\各小区优化方案报告" + "\" + ACellNameChecked + "网内干扰优化方案.txt";

FileStream FS = new FileStream(InSysInterAnalyReportWordSavePath, FileMode.Create);
StreamWriter SW = new StreamWriter(FS);

string Box = AnalysisCellNamecomboBox.Text;
string AcellName = OptimizeDictionaryAl[Box].Keys.ToList()[0];
string NcellName1 = OptimizeDictionaryAl[Box].Keys.ToList()[1];
string NcellName2 = OptimizeDictionaryAl[Box].Keys.ToList()[2];
string NcellName3 = OptimizeDictionaryAl[Box].Keys.ToList()[3];

StringBuilder ACell = new System.Text.StringBuilder("受扰小区：" + AcellName + "；");
StringBuilder Ncell1 = new System.Text.StringBuilder("干扰源小区1：" + NcellName1 + "；");
StringBuilder Ncell2 = new System.Text.StringBuilder("干扰源小区2：" + NcellName2 + "；");
StringBuilder Ncell3 = new System.Text.StringBuilder("干扰源小区3：" + NcellName3 + "；");

SW.Write(txt(ACell, Box, AcellName, "a") + " ");
SW.Write(txt(Ncell1, Box, NcellName1, "b") + " ");
SW.Write(txt(Ncell2, Box, NcellName2, "a") + " ");
SW.Write(txt(Ncell3, Box, NcellName3, "b") + " ");

SW.Flush(); //清空缓冲区
SW.Close(); //关闭流
FS.Close();
}