private void ContextMenuStrip1_Opening(object sender, System.ComponentModel.CancelEventArgs e) { if (this.handle != IntPtr.Zero) { foreach (ToolStripMenuItem item in contextMenuStrip.Items) { if (item.Text == "返回") { item.Enabled = BlinkBrowserPInvoke.wkeCanGoBack(this.handle); } if (item.Text == "前进") { item.Enabled = BlinkBrowserPInvoke.wkeCanGoForward(this.handle); } //if (item.Text == "全选") //{ // item.Enabled = wkeCanGoForward(this.handle); //} } } }