c# .net 查找并安装CA根证书

https CA根证书

用的是证书指纹来查找。

在用 collection.Find 之前 ，X509Store 一定要打开(Open)，否则找到的数量(X509Certificate2Collection)为0.

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X509Store store = new X509Store(StoreName.Root, StoreLocation.LocalMachine);//获取本地计算机受信任的根证书的储存区
            store.Open(OpenFlags.MaxAllowed); //查找证书前，一定要打开

            X509Certificate2Collection collection = store.Certificates;//获取储存区上的所有证书
            //DigiCert Global Root CA,Thumbprint: A8985D3A65E5E5C4B2D7D66D40C6DD2FB19C5436
            string Thumbprint = "A8985D3A65E5E5C4B2D7D66D40C6DD2FB19C5436";
            //按指纹查找，系统是否内置了这个根证书
            X509Certificate2Collection fcollection = collection.Find(X509FindType.FindByThumbprint, Thumbprint, false);

            try
            {
                if (fcollection != null)
                {
                    if (fcollection.Count > )
                    {
                        DialogResult dr = MessageBox.Show("查找数量:" + fcollection.Count.ToString() + " ,是否删除？", "", MessageBoxButtons.YesNo);
                        if (dr == DialogResult.Yes)
                        {
                            store.RemoveRange(fcollection);
                            return;
                        }
                    }
                    else
                    {
                        MessageBox.Show("查找数量:" + fcollection.Count.ToString());
                    }
                }

                if (fcollection != null && fcollection.Count == )
                {
                    //    MessageBox.Show("没有 DigiCert Global Root CA");
                    DialogResult dr = MessageBox.Show("没有 'DigiCert Global Root CA' ,是否导入？", "", MessageBoxButtons.YesNo);
                    if (dr == DialogResult.No)
                        return;

                    string crtFullName = Path.Combine(Application.StartupPath, "DigiCertGlobalRootCA.crt");
                    if (File.Exists(crtFullName))
                    {
                        X509Certificate2 x509 = new X509Certificate2(crtFullName);
                        //安装证书,证书（本地计算机）-受信任的根证书的储存区
                        store.Add(x509);
                    }

                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                store.Close(); //finally关闭
            }

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