C#读取数据库返回泛型集合 把DataSet类型转换为List<T>泛型集合

/// <summary>

/// 获取UserInfo泛型集合

/// </summary>

/// <param name="connStr">数据库连接字符串</param>

/// <param name="sqlStr">要查询的T-SQL</param>

/// <returns></returns>

public IList<UserInfo> GetUserInfoAll(string connStr, string sqlStr)

{

using (SqlConnection conn = new SqlConnection(connStr))

{

using (SqlCommand cmd = new SqlCommand(sqlStr, conn))

{

SqlDataReader sdr = cmd.ExecuteReader();

IList<UserInfo> list = new List<UserInfo>();

while (sdr.Read())

{

UserInfo userInfo = new UserInfo();

userInfo.ID = (Guid)sdr["ID"];

userInfo.LoginName = sdr["LoginName"].ToString();

userInfo.LoginPwd = sdr["LoginPwd"].ToString();

list.Add(userInfo);

}

return list;

}

}

}

/// <summary>

/// 获取泛型集合

/// </summary>

/// <typeparam name="T">类型</typeparam>

/// <param name="connStr">数据库连接字符串</param>

/// <param name="sqlStr">要查询的T-SQL</param>

/// <returns></returns>

public IList<T> GetList<T>(string connStr, string sqlStr)

{

using (SqlConnection conn = new SqlConnection(connStr))

{

using (SqlDataAdapter sda = new SqlDataAdapter(sqlStr, conn))

{

DataSet ds = new DataSet();

sda.Fill(ds);

return DataSetToList<T>(ds, 0);

}

}

}

/// <summary>

/// DataSetToList

/// </summary>

/// <typeparam name="T">转换类型</typeparam>

/// <param name="dataSet">数据源</param>

/// <param name="tableIndex">需要转换表的索引</param>

/// <returns></returns>

public IList<T> DataSetToList<T>(DataSet dataSet, int tableIndex)

{

//确认参数有效

if (dataSet == null || dataSet.Tables.Count <= 0 || tableIndex < 0)

return null;

DataTable dt = dataSet.Tables[tableIndex];

IList<T> list = new List<T>();

for (int i = 0; i < dt.Rows.Count; i++)

{

//创建泛型对象

T _t = Activator.CreateInstance<T>();

//获取对象所有属性

PropertyInfo[] propertyInfo = _t.GetType().GetProperties();

for (int j = 0; j < dt.Columns.Count; j++)

{

foreach (PropertyInfo info in propertyInfo)

{

//属性名称和列名相同时赋值

if (dt.Columns[j].ColumnName.ToUpper().Equals(info.Name.ToUpper()))

{

if (dt.Rows[i][j] != DBNull.Value)

{

info.SetValue(_t, dt.Rows[i][j], null);

}

else

{

info.SetValue(_t, null, null);

}

break;

}

}

}

list.Add(_t);

}

return list;

}

public class UserInfo

{

public System.Guid ID { get; set; }

public string LoginName { get; set; }

public string LoginPwd { get; set; }

}