TXT插入者批量随机插入代码

private void btn_PLEnglishSingleInsert_Click(object sender, EventArgs e)
{
    if ((this.txtb_FolderIn.Text == string.Empty) || !Directory.Exists(this.txtb_FolderIn.Text))
    {
        MessageBox.Show("批量插入的文件夹路径错误!");
    }
    else if ((this.txtb_FolderOut.Text == string.Empty) || !Directory.Exists(this.txtb_FolderOut.Text))
    {
        MessageBox.Show("批量输出的文件夹路径错误!");
    }
    else
    {
        spin spin = new spin();
        string contents = "";
        if (this.cb_Subfolder.Checked)
        {
            foreach (string str2 in Directory.GetDirectories(this.txtb_FolderIn.Text))
            {
                DirectoryInfo info = new DirectoryInfo(str2);
                foreach (FileInfo info2 in info.GetFiles("*.txt"))
                {
                    using (StreamReader reader = info2.OpenText())
                    {
                        string str3;
                        int num3;
                        int num4;
                        Random random;
                        int num6;
                        int length = 0;
                        int index = 0;
                        bool flag = false;
                        if ((this.txtb_FolderIn.Text == string.Empty) || !Directory.Exists(this.txtb_FolderIn.Text))
                        {
                            MessageBox.Show("批量插入的文件夹路径错误!");
                        }
                        else if ((this.txtb_FolderOut.Text == string.Empty) || !Directory.Exists(this.txtb_FolderOut.Text))
                        {
                            MessageBox.Show("批量输出的文件夹路径错误!");
                        }
                        else if (this.txtb_Keywords.Text == string.Empty)
                        {
                            MessageBox.Show("输入不完全, 请填写完整!");
                        }
                        else if ((this.txtb_RandomTime.Text == string.Empty) && this.rb_PartIn.Checked)
                        {
                            MessageBox.Show("输入不完全, 请填写完整!");
                        }
                        else
                        {
                            str3 = reader.ReadToEnd();
                            num3 = str3.Length;
                            num4 = 0;
                            random = new Random(DateTime.Now.Second);
                            for (int j = 0; j < str3.Length; j++)
                            {
                                if (str3[j] == ' ')
                                {
                                    flag = true;
                                }
                            }
                            if (!flag)
                            {
                                MessageBox.Show("文章内无空格, 非法");
                            }
                            else
                            {
                                if (!this.rb_PartIn.Checked)
                                {
                                    goto Label_0508;
                                }
                                num6 = int.Parse(this.txtb_RandomTime.Text);
                                if (num6 <= this.txtb_Keywords.Lines.Length)
                                {
                                    goto Label_03DA;
                                }
                                MessageBox.Show("插入个数不能小于插入内容栏内项的个数, 请重新输入!");
                            }
                        }
                        return;
                    Label_025A:
                        length = random.Next(3, num3 - 2);
                        if ((str3[length - 1] == ' ') && (str3[length] == ' '))
                        {
                            index++;
                            num4 = random.Next(num6 + 1, num6 + 100);
                            str3 = str3.Substring(0, length) + spin.Spinner(this.txtb_Keywords.Lines[num4 % this.txtb_Keywords.Lines.Length], num4) + str3.Substring(length);
                        }
                        else if (str3[length - 1] == ' ')
                        {
                            if (str3[length - 3] != '<')
                            {
                                index++;
                                num4 = random.Next(num6 + 1, num6 + 100);
                                str3 = str3.Substring(0, length) + spin.Spinner(this.txtb_Keywords.Lines[num4 % this.txtb_Keywords.Lines.Length], num4) + " " + str3.Substring(length);
                            }
                        }
                        else if ((str3[length + 1] == ' ') && (str3[length - 1] != '<'))
                        {
                            index++;
                            num4 = random.Next(num6 + 1, num6 + 100);
                            str3 = str3.Substring(0, length + 1) + " " + spin.Spinner(this.txtb_Keywords.Lines[num4 % this.txtb_Keywords.Lines.Length], num4) + str3.Substring(length + 1);
                        }
                    Label_03DA:
                        if (index < num6)
                        {
                            goto Label_025A;
                        }
                        goto Label_051C;
                    Label_03E8:
                        length = random.Next(3, num3 - 2);
                        if ((str3[length - 1] == ' ') && (str3[length] == ' '))
                        {
                            str3 = str3.Substring(0, length) + spin.Spinner(this.txtb_Keywords.Lines[index], length) + str3.Substring(length);
                            index++;
                        }
                        else if (str3[length - 1] == ' ')
                        {
                            if (str3[length - 3] != '<')
                            {
                                str3 = str3.Substring(0, length) + spin.Spinner(this.txtb_Keywords.Lines[index], length) + " " + str3.Substring(length);
                                index++;
                            }
                        }
                        else if ((str3[length + 1] == ' ') && (str3[length - 1] != '<'))
                        {
                            str3 = str3.Substring(0, length + 1) + " " + spin.Spinner(this.txtb_Keywords.Lines[index], length) + str3.Substring(length + 1);
                            index++;
                        }
                    Label_0508:
                        if (index < this.txtb_Keywords.Lines.Length)
                        {
                            goto Label_03E8;
                        }
                    Label_051C:
                        contents = str3;
                        string path = "";
                        for (int i = this.txtb_FolderIn.Text.Length + 1; i < str2.Length; i++)
                        {
                            path = path + str2[i];
                        }
                        new DirectoryInfo(this.txtb_FolderOut.Text).CreateSubdirectory(path);
                        File.AppendAllText(this.txtb_FolderOut.Text + @"\" + path + @"\" + info2.Name, contents);
                    }
                }
            }
            MessageBox.Show("成功!");
        }
        else
        {
            DirectoryInfo info4 = new DirectoryInfo(this.txtb_FolderIn.Text);
            foreach (FileInfo info5 in info4.GetFiles("*.txt"))
            {
                using (StreamReader reader2 = info5.OpenText())
                {
                    string str5;
                    int num10;
                    int num11;
                    int num12;
                    Random random2;
                    int num8 = 0;
                    int num9 = 0;
                    bool flag2 = false;
                    if (this.txtb_Keywords.Text == string.Empty)
                    {
                        MessageBox.Show("输入不完全, 请填写完整!");
                    }
                    else
                    {
                        str5 = reader2.ReadToEnd();
                        num10 = str5.Length;
                        num11 = 0;
                        num12 = this.txtb_Keywords.Lines.Length;
                        if (num12 > this.txtb_Keywords.Lines.Length)
                        {
                            MessageBox.Show("插入个数不能小于插入内容栏内项的个数, 请重新输入!");
                        }
                        else
                        {
                            random2 = new Random(DateTime.Now.Second);
                            for (int k = 0; k < str5.Length; k++)
                            {
                                if (str5[k] == ' ')
                                {
                                    flag2 = true;
                                }
                            }
                            if (!flag2)
                            {
                                MessageBox.Show("文章内无空格, 非法");
                            }
                            else
                            {
                                if (!this.rb_PartIn.Checked)
                                {
                                    goto Label_09F5;
                                }
                                num12 = int.Parse(this.txtb_RandomTime.Text);
                                if (num12 <= this.txtb_Keywords.Lines.Length)
                                {
                                    goto Label_08C7;
                                }
                                MessageBox.Show("插入个数不能小于插入内容栏内项的个数, 请重新输入!");
                            }
                        }
                    }
                    return;
                Label_0747:
                    num8 = random2.Next(3, num10 - 2);
                    if ((str5[num8 - 1] == ' ') && (str5[num8] == ' '))
                    {
                        num9++;
                        num11 = random2.Next(num12 + 1, num12 + 100);
                        str5 = str5.Substring(0, num8) + spin.Spinner(this.txtb_Keywords.Lines[num11 % this.txtb_Keywords.Lines.Length], num11) + str5.Substring(num8);
                    }
                    else if (str5[num8 - 1] == ' ')
                    {
                        if (str5[num8 - 3] != '<')
                        {
                            num9++;
                            num11 = random2.Next(num12 + 1, num12 + 100);
                            str5 = str5.Substring(0, num8) + spin.Spinner(this.txtb_Keywords.Lines[num11 % this.txtb_Keywords.Lines.Length], num11) + " " + str5.Substring(num8);
                        }
                    }
                    else if ((str5[num8 + 1] == ' ') && (str5[num8 - 1] != '<'))
                    {
                        num9++;
                        num11 = random2.Next(num12 + 1, num12 + 100);
                        str5 = str5.Substring(0, num8 + 1) + " " + spin.Spinner(this.txtb_Keywords.Lines[num11 % this.txtb_Keywords.Lines.Length], num11) + str5.Substring(num8 + 1);
                    }
                Label_08C7:
                    if (num9 < num12)
                    {
                        goto Label_0747;
                    }
                    goto Label_0A09;
                Label_08D5:
                    num8 = random2.Next(3, num10 - 2);
                    if ((str5[num8 - 1] == ' ') && (str5[num8] == ' '))
                    {
                        str5 = str5.Substring(0, num8) + spin.Spinner(this.txtb_Keywords.Lines[num9], num8) + str5.Substring(num8);
                        num9++;
                    }
                    else if (str5[num8 - 1] == ' ')
                    {
                        if (str5[num8 - 3] != '<')
                        {
                            str5 = str5.Substring(0, num8) + spin.Spinner(this.txtb_Keywords.Lines[num9], num8) + " " + str5.Substring(num8);
                            num9++;
                        }
                    }
                    else if ((str5[num8 + 1] == ' ') && (str5[num8 - 1] != '<'))
                    {
                        str5 = str5.Substring(0, num8 + 1) + " " + spin.Spinner(this.txtb_Keywords.Lines[num9], num8) + str5.Substring(num8 + 1);
                        num9++;
                    }
                Label_09F5:
                    if (num9 < this.txtb_Keywords.Lines.Length)
                    {
                        goto Label_08D5;
                    }
                Label_0A09:
                    contents = str5;
                    File.AppendAllText(this.txtb_FolderOut.Text + @"\" + info5.Name, contents);
                }
            }
            MessageBox.Show("成功!");
        }
    }
}