csharp: Setting the value of properties reflection

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using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Reflection; using System.IO;   namespace WinPropertyInfo {         /// <summary>     /// Geovin Du     /// </summary>     public partial class Form1 : Form     {             /// <summary>         ///         /// </summary>         /// <returns></returns>         DataTable setData()         {             Image img = Image.FromFile(@"C:\Documents and Settings\geovindu\My Documents\My Pictures\sqlanywhereODBC20180208160133.png");               DataTable dt = new DataTable();             dt.Columns.Add("MyName", typeof(string));             dt.Columns.Add("IsJob", typeof(bool));             dt.Columns.Add("Salary", typeof(float));             dt.Columns.Add("Bonus", typeof(double));             dt.Columns.Add("Insurance", typeof(decimal));             dt.Columns.Add("Age", typeof(int));             dt.Columns.Add("Photo", typeof(Image));             dt.Columns.Add("Birthaday", typeof(DateTime));             //dt.Columns.Add("", typeof(bool));             dt.Rows.Add("geovindu", true, -950, 1789.03, 78.09, 79, img, DateTime.Now);             dt.Rows.Add("塗聚文", true, -8950, 789.03, 5178.09, 29, img, DateTime.Now);                 return dt;         }               /// <summary>         ///         /// </summary>         public Form1()         {             InitializeComponent();         }         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void Form1_Load(object sender, EventArgs e)         {             List<GeovinDuInfo> list = new List<GeovinDuInfo>();             Image img = Image.FromFile(@"C:\Documents and Settings\geovindu\My Documents\My Pictures\sqlanywhereODBC20180208160133.png",false);             byte[] imgbyt = ToByteArray(img);               try             {                 //GeovinDuInfo info = new GeovinDuInfo();                 //SetPropertyValue(info, "MyName", "geovindu");                 //SetPropertyValue(info, "IsJob", true);                 //SetPropertyValue(info, "Salary", -850);                 //SetPropertyValue(info, "Bonus", 78.02);                 //SetPropertyValue(info, "Insurance", 78.02);                 //SetPropertyValue(info, "Age", 78);                 //SetPropertyValue(info, "Photo", imgbyt);  //不可賦值                 //SetPropertyValue(info, "Birthaday", DateTime.Now);                 //list.Add(info);                 DataTable dt = setData();                 if (dt.Rows.Count > 0)                 {                     for (int i = 0; i < dt.Rows.Count; i++)                     {                         GeovinDuInfo info = DataRowToModel(dt.Rows[i]);                         list.Add(info);                     }                 }                   this.dataGridView1.DataSource = list;//setData();//                               }             catch (Exception ex)             {                 MessageBox.Show(ex.Message.ToString());             }           }             /// <summary>         /// 賦值         /// </summary>         /// <param name="obj"></param>         /// <param name="propertyName"></param>         /// <param name="propertyValue"></param>         public static void SetPropertyValue(object obj, string propertyName, object propertyValue)         {             if (obj == null || string.IsNullOrEmpty(propertyName))  //IsNullOrWhiteSpace             {                 return;             }             Type objectType = obj.GetType();               PropertyInfo propertyDetail = objectType.GetProperty(propertyName);                 if (propertyDetail != null && propertyDetail.CanWrite)             {                 Type propertyType = propertyDetail.PropertyType;                   Type dataType = propertyType;                   // Check for nullable types                 if (propertyType.IsGenericType && propertyType.GetGenericTypeDefinition() == typeof(Nullable<>))                 {                     // Check for null or empty string value.                     if (propertyValue == null || string.IsNullOrEmpty(propertyValue.ToString()))                     {                         propertyDetail.SetValue(obj, null,null);                         return;                     }                     else                     {                         dataType = propertyType.GetGenericArguments()[0];                     }                 }                   propertyValue = Convert.ChangeType(propertyValue, propertyType);                   propertyDetail.SetValue(obj, propertyValue,null);               }         }         /// <summary>         ///         /// </summary>         /// <param name="data"></param>         /// <returns></returns>         public bool ValidateData(object data)         {             foreach (PropertyInfo propertyInfo in data.GetType().GetProperties())             {                 if (propertyInfo.PropertyType == typeof(string))                 {                     string value = propertyInfo.GetValue(data, null);                     if (value == "geovindu")                     {                         return false;                     }                   }             }                          return true;         }         /// <summary>         ///         /// </summary>         /// <param name="row"></param>         /// <returns></returns>         public GeovinDuInfo DataRowToModel(DataRow row)         {             GeovinDuInfo model = new GeovinDuInfo();             if (row != null)             {                 //利用反射获得属性的所有公共属性                 Type modelType = model.GetType();                   for (int i = 0; i < row.Table.Columns.Count; i++)                 {                     //查找实体是否存在列表相同的公共属性                     PropertyInfo proInfo = modelType.GetProperty(row.Table.Columns[i].ColumnName);                       Type propertyType = proInfo.PropertyType;                       Type dataType = propertyType;                       if (proInfo != null && row[i] != DBNull.Value)                     {                         if (proInfo != null && proInfo.CanWrite)                         {                           }                         if (dataType.Equals(typeof(Single)))  //要考慮數据類型，否則會出錯                         {                             //propertyValue = Convert.ToSingle(propertyValue);                             proInfo.SetValue(model, Convert.ToSingle(row[i], null)); //float類型轉換                         }                         else if (dataType.Equals(typeof(Double)))                         {                             proInfo.SetValue(model, Convert.ToDouble(row[i], null));                         }                         else if (dataType.Equals(typeof(Boolean)))                         {                             proInfo.SetValue(model, Convert.ToBoolean(row[i], null));                         }                         else if (dataType.Equals(typeof(Int32)))                         {                             proInfo.SetValue(model,Convert.ToInt32(row[i],null));                         }                         else if (dataType.Equals(typeof(Decimal)))                         {                             proInfo.SetValue(model, Convert.ToDecimal(row[i], null));                         }                         else                         {                             //proInfo.SetValue(model, Convert.ChangeType(row[i], propertyType), null);                             proInfo.SetValue(model, row[i], null);//用索引值设置属性值 負數  float                         }                                                   }                 }             }             return model;         }           /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void button1_Click(object sender, EventArgs e)         {           }         /// <summary>         ///         /// </summary>         /// <param name="imageIn"></param>         /// <returns></returns>           public static byte[] ToByteArray(Image imageIn)          {             MemoryStream ms = new MemoryStream();             imageIn.Save(ms, System.Drawing.Imaging.ImageFormat.Png);             return ms.ToArray();          }               //Convert byte[] array to Image:         /// <summary>         ///         /// </summary>         /// <param name="byteArrayIn"></param>         /// <returns></returns>         public static Image ToImage(byte[] byteArrayIn)         {             MemoryStream ms = new MemoryStream(byteArrayIn);             Image returnImage = Image.FromStream(ms);             return returnImage;         }         }     /// <summary>     /// 塗聚文 涂聚文     /// Geovin Du     ///     /// </summary>     public class GeovinDuInfo     {             private string _MyName = string.Empty;         /// <summary>         ///         /// </summary>         public string MyName         {             get { return _MyName; }             set { _MyName = value; }         }         private bool _IsJob = true;         /// <summary>         ///         /// </summary>         public bool IsJob         {             get { return _IsJob; }             set { _IsJob = value; }         }           private float _Salary = 0;         /// <summary>         ///         /// </summary>         public float Salary         {             get { return _Salary; }             set { _Salary = value; }         }           private double _Bonus = 0.00;         /// <summary>         ///         /// </summary>         public double Bonus         {             get { return _Bonus; }             set { _Bonus = value; }         }           private decimal _Insurance;         /// <summary>         ///         /// </summary>         public decimal Insurance         {             get { return _Insurance; }             set { _Insurance = value; }         }               private int _Age = 0;         /// <summary>         ///         /// </summary>         public int Age         {               get { return _Age; }             set { _Age = value; }          }           private Image _Photo;         /// <summary>         ///         /// </summary>         public Image Photo         {             get { return _Photo; }             set { _Photo = value; }         }           private DateTime _Birthaday = DateTime.Now;         /// <summary>         ///         /// </summary>         public DateTime Birthaday         {             get { return _Birthaday; }             set { _Birthaday = value; }         }         }   }