filestream fs = new filestream("c:\\s.txt", filemode.create, fileaccess.write);
streamwriter sw = new streamwriter(fs);
sw.basestream.seek(0, seekorigin.begin);
for (int i = 0; i < 10; i++)
sw.close();
c# 寫入txt 檔案
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streamreader sr = new streamreader("c:\\s.txt", false);
str = sr.readline().tostring();
sr.close();
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