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object fnb = comboBox2.SelectedItem;
webBrowser2.Document.ExecCommand("SelectAll", true, null);
webBrowser2.Document.ExecCommand("FontSize", false, fnb);
webBrowser2.Document.ExecCommand("Unselect", true, null);
this.webBrowser2.Document.ExecCommand("SelectAll", true, null);
this.webBrowser2.Document.ExecCommand("FontSize", true, null);
this.webBrowser2.Document.ExecCommand("Unselect", true, null);
一样会报错