SharePoint API测试系列——对Recorded Item做OM操作（委托的妙用）

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对Recorded Item动态调用OM Methods进行测试，界面如下：

输入Site的URL，File在SharePoint中的相对URL，并选择OM操作类型，点击Test进行测试。代码如下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Microsoft.SharePoint;

namespace RecordsOMTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            OMMethods_comboBox.Items.Add("Rename");
            OMMethods_comboBox.Items.Add("File item delete");
            OMMethods_comboBox.Items.Add("File delete");
            OMMethods_comboBox.Items.Add("File item recycle");
            OMMethods_comboBox.Items.Add("File recycle");
            OMMethods_comboBox.Items.Add("File undo check out");
            OMMethods_comboBox.Items.Add("File check in");
            OMMethods_comboBox.Items.Add("File check out");
        }

        public delegate void CallOMMethod(SPFile file);

        private void test_button_Click(object sender, EventArgs e)
        {
            /*
                Block delete test.
            */
            //Rename test.
            CallOMMethod Rename = file => { file.Item["Name"] = "kkk.txt"; file.Item.Update(); };
            //Delete test 1.
            CallOMMethod delete1 = file => { file.Item.Delete(); };
            //Delete test 2.
            CallOMMethod delete2 = file => { file.Delete(); };
            //Delete test 3.
            CallOMMethod delete3 = file => { file.Item.Recycle(); };
            //Delete test 4.
            CallOMMethod delete4 = file => { file.Recycle(); };

            /*
                Block edit and delete test.
            */
            //UndoCheckOut test.
            CallOMMethod UndoCKOut = file => { file.UndoCheckOut(); };
            //CheckIn test.
            CallOMMethod CkIn = file => { file.CheckIn("Check in."); };
            //CheckOut test.
            CallOMMethod CkOut = file => { file.CheckOut(); };

            switch (OMMethods_comboBox.Text)
            {
                case "Rename":
                    //Rename test.
                    DoOMTest(Rename);
                    break;
                case "File item delete":
                    DoOMTest(delete1);
                    break;
                case "File delete":
                    DoOMTest(delete2);
                    break;
                case "File item recycle":
                    DoOMTest(delete3);
                    break;
                case "File recycle":
                    DoOMTest(delete4);
                    break;
                case "File undo check out":
                    DoOMTest(UndoCKOut);
                    break;
                case "File check in":
                    DoOMTest(CkIn);
                    break;
                case "File check out":
                    DoOMTest(CkOut);
                    break;
            }
        }
        private void DoOMTest(CallOMMethod cm)
        {
            using (SPSite site = new SPSite(siteUrl_textBox.Text))
            {
                SPWeb web = site.RootWeb;
                SPFile file = web.GetFile(filePath_textBox.Text);
                try
                {
                    cm.Invoke(file);
                    //Reach this step means test failed.
                    result_richTextBox.Text = "Test failed.
";
                    result_richTextBox.SelectionColor = Color.Red;
                }
                catch (Exception ex)
                {
                    result_richTextBox.Text = "Test passed.
";
                    result_richTextBox.Select(0, result_richTextBox.Text.Length);
                    result_richTextBox.SelectionColor = Color.Green;
                    result_richTextBox.Text += string.Concat(ex);
                } 
            }
        }
    }
}

提取每个OM Methods单元测试中的公共部分写成DoOMTest(CallOMMethod cm)方法，对于每个测试中不同的部分通过调用一个委托方法（橙色字体）来代替。然后我们对委托方法的类型进行声明（委托方法需要传入一个SPFile类型的参数）：

public delegate void CallOMMethod(SPFile file);

再根据每个测试中的不同部分内容对委托进行实例化：

//Rename test.
CallOMMethod Rename = file => { file.Item["Name"] = "kkk.txt"; file.Item.Update(); };
//Delete test 1.
CallOMMethod delete1 = file => { file.Item.Delete(); };
//Delete test 2.
CallOMMethod delete2 = file => { file.Delete(); };
//Delete test 3.
CallOMMethod delete3 = file => { file.Item.Recycle(); };
//Delete test 4.
CallOMMethod delete4 = file => { file.Recycle(); };
//UndoCheckOut test.
CallOMMethod UndoCKOut = file => { file.UndoCheckOut(); };
//CheckIn test.
CallOMMethod CkIn = file => { file.CheckIn("Check in."); };
//CheckOut test.
CallOMMethod CkOut = file => { file.CheckOut(); };

这就是委托在测试中的妙用，极大的减少了重复代码量。