OpenFileDialog openFileDialog1 = new OpenFileDialog ();
openFileDialog1.CheckFileExists = true;
openFileDialog1.CheckPathExists = true;
openFileDialog1.Filter = "Zip Files(*.zip)";
openFileDialog1.CheckFileExists = true;
openFileDialog1.CheckPathExists = true;
openFileDialog1.Filter = "Zip Files(*.zip)";
怎么控制文件上传时的文件类型
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