/// <summary>
/// 将数据行转换为指定类型的对象
/// </summary>
/// <typeparam name="T">指定类型</typeparam>
/// <param name="row">数据行</param>
/// <param name="excludeProperties">需要排除的属性名称列表</param>
/// <returns></returns>
internal static T ToObject <T>(DataRow row, params string[] excludeProperties)
{
if (row == null)
{
return(default(T));
}
//获取限定类型的类类型
Type targetType = typeof(T);
//通过反射中的激活器根据指定类型的无参构造函数创建对象实例
T resultObject = Activator.CreateInstance <T>();
//根据当前数据行获取拥有其架构的数据表对象
DataTable table = row.Table;
//指示属性为公开的、含有Set访问的、含有实例的、忽略大小写的
BindingFlags bindingFlags = BindingFlags.Public | BindingFlags.SetProperty | BindingFlags.Instance | BindingFlags.IgnoreCase;
foreach (DataColumn column in table.Columns)
{
if (excludeProperties.Contains <string>(column.ColumnName))
{
continue;
}
//根据列名称获取目标类型中的属性对象
PropertyInfo targetProperty = targetType.GetProperty(column.ColumnName, bindingFlags);
//如果未找到对象则抛出异常
if (targetProperty == null)
{
throw new PropertyNotFoundException(targetType.FullName, column.ColumnName);
}
//获取用户自定义特性
Attribute attribute = targetProperty.GetCustomAttribute(typeof(NonReflectionAttribute));
if (attribute != null)
{
continue;
}
//获取指定属性的类类型
Type propertyType = targetProperty.PropertyType;
object parameters = null;
bool convertFlag = true;
try
{
parameters = DataTypeHelper.ChangeType(propertyType, row[column]);
}
catch { convertFlag = false; }
//如果数据类型转换成功，则将单元格中的值保存到指定属性中
if (convertFlag)
{
targetType.InvokeMember(column.ColumnName, bindingFlags, null, resultObject, new object[] { parameters });
}
}
return(resultObject);
}
/// <summary>
/// 获取指定类型配置信息，并转换为指定类型
/// </summary>
/// <typeparam name="T">需要转换的类型</typeparam>
/// <param name="key">配置键</param>
/// <returns></returns>
public static T Get <T>(string key)
{
string setting = ConfigurationManager.AppSettings[key];
if (string.IsNullOrEmpty(setting))
{
return(default(T));
}
return((T)DataTypeHelper.ChangeType(typeof(T), setting));
}
public T Get <T>(string key)
{
if (typeof(T) == typeof(string))
{
HttpCookie cookie = Context.Request.Cookies[key];
if (cookie != null)
{
return((T)DataTypeHelper.ChangeType(typeof(T), cookie.Value));
}
}
return(default(T));
}
/// <summary>
/// 获取单个结果
/// </summary>
/// <typeparam name="T">结果类型</typeparam>
/// <param name="helper">数据库操作辅助对象</param>
/// <param name="tableName">表名</param>
/// <param name="columnName">列名称</param>
/// <param name="param">数据库操作参数</param>
/// <returns></returns>
public static T GetSingleResult <T>(this SqlHelper helper, string tableName, string columnName, params SqlParameter[] param)
{
string commandText = string.Format("SELECT TOP 1 {0} FROM {1}(NOLOCK)", columnName, tableName);
if (param != null)
{
commandText += " WHERE 1=1 ";
foreach (var item in param)
{
string key = item.ParameterName.StartsWith("@") ? item.ParameterName.Substring(1) : item.ParameterName;
string value = item.ParameterName.StartsWith("@") ? item.ParameterName : "@" + item.ParameterName;
commandText += string.Format("AND {0}={1}", key, value);
}
}
object tmpObjResult = helper.ExecuteScalar(CommandType.Text, commandText, param);
return((T)DataTypeHelper.ChangeType(typeof(T), tmpObjResult));
}
/// <summary>
/// 获取单个结果
/// </summary>
/// <typeparam name="T">结果类型</typeparam>
/// <param name="helper">数据库操作辅助对象</param>
/// <param name="commandType">数据库操作类型</param>
/// <param name="commandText">数据库操作语句</param>
/// <param name="param">数据库操作参数</param>
/// <returns></returns>
public static T GetSingleResult <T>(this SqlHelper helper, CommandType commandType, string commandText, params SqlParameter[] param)
{
object tmpObjResult = helper.ExecuteScalar(commandType, commandText, param);
return((T)DataTypeHelper.ChangeType(typeof(T), tmpObjResult));
}
