/// <summary>
/// IDataRecord到对象的转换
/// </summary>
/// <typeparam name="T">需要被转换的类型</typeparam>
/// <param name="drs">IDataRecord数组</param>
/// <param name="objs">需要被填充的对象列表（类型一致的对象，不允许空引用）</param>
/// <param name="columnBindingFlags">BindingFlags</param>
public static void TransObject <T>(IDataRecord[] drs, T[] objs, BindingFlags columnBindingFlags)
{
if (objs == null || objs.Length == 0 || drs == null || drs.Length == 0)
{
return;
}
int num = drs.Length;
if (objs.Length < num)
{
num = objs.Length;
}
Type type = typeof(T);
IFieldMemberInfo[] columns = FieldMemberInfo.GetFieldMembers(type, columnBindingFlags);
for (int i = 0; i < num; i++)
{
IDataRecord dr = drs[i];
for (int k = 0; k < columns.Length; k++)
{
if (columns[k].CanWrite)
{
columns[k].SetValue(objs[i], dr[columns[k].Name]);
}
}
}
}
/// <summary>
/// 实体属性到WebForm数据的转换
/// </summary>
/// <param name="entity">实体（不允许空引用），支持<see cref="DataRow"/></param>
/// <param name="form">被转换的WebForm实体（Page的派生类）</param>
/// <example>
/// <code>
/// public class myPage : System.Web.UI.Page
/// {
/// [Column("Title")]
/// protected TextBox txtTitle;
/// [Column("Description")]
/// protected TextBox txtDescription;
///
/// private void Page_Load(object sender, EventArgs e) {
/// YourEntity entity;
/// //load entity data ...
/// DataTransfer.TransEntityPropertyToWebFormData(entity, this);
/// }
/// }
/// </code>
/// </example>
public static void TransEntityPropertyToWebFormData(object entity, object form)
{
if (form == null || entity == null)
{
return;
}
Type formType = form.GetType();
Type entityType = entity.GetType();
IFieldMemberInfo[] columns = FieldMemberInfo.GetFieldMembers(formType, BindingFlags.GetField | BindingFlags.GetProperty | BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public, true);
for (int i = 0; i < columns.Length; i++)
{
if (columns[i].CanWrite)
{
object value = null;
if (entity is DataRow)
{
DataRow dr = (DataRow)entity;
value = dr[columns[i].Name];
}
else
{
PropertyInfo property = entityType.GetProperty(columns[i].Name, ColumnBindingFlags);
if (property != null && property.CanRead)
{
value = property.GetValue(entity, null);
}
}
if (value == null)
{
continue;
}
object fieldObject = columns[i].GetValue(form);
string stringValue = (string)Convert.ChangeType(value, typeof(string));
if (fieldObject is TextBox)
{
(fieldObject as TextBox).Text = stringValue;
}
else if (fieldObject is DropDownList)
{
DropDownList ddl = fieldObject as DropDownList;
ddl.ClearSelection();
WebHelper.SetDropDownListValueSafely(ddl, stringValue);
}
else if (fieldObject is Label)
{
(fieldObject as Label).Text = stringValue;
}
else if (fieldObject is HyperLink)
{
(fieldObject as HyperLink).Text = stringValue;
}
else
{
continue;
}
}
}
}
public static MemberInfo getInfo(FieldInfo field) {
var result = field.getUserData(typeof(FieldMemberInfo));
if (result == null) {
result = new FieldMemberInfo(field);
field.addUserData(result);
}
return result;
}
public static MemberInfo getInfo(FieldInfo field)
{
var result = field.getUserData(typeof(FieldMemberInfo));
if (result == null)
{
result = new FieldMemberInfo(field);
field.addUserData(result);
}
return(result);
}
/// <summary>
/// 对象到DataTable的转换
/// </summary>
/// <param name="obj">对象</param>
/// <param name="dr">DataRow</param>
public static void TransObject <T>(T obj, DataRow dr)
{
if (obj == null || dr == null)
{
return;
}
Type type = typeof(T);
IFieldMemberInfo[] columns = FieldMemberInfo.GetFieldMembers(type, ColumnBindingFlags);
for (int k = 0; k < columns.Length; k++)
{
if (columns[k].CanRead)
{
dr[columns[k].Name] = columns[k].GetValue(obj);
}
}
}
/// <summary>
/// 对象到DataTable的转换
/// </summary>
/// <param name="objs">对象列表（类型一致的对象）</param>
/// <param name="dt">DataTable</param>
/// <param name="columnBindingFlags">BindingFlags</param>
public static void TransObject <T>(T[] objs, DataTable dt, BindingFlags columnBindingFlags)
{
if (objs == null || objs.Length == 0 || dt == null)
{
return;
}
Type type = typeof(T);
IFieldMemberInfo[] columns = FieldMemberInfo.GetFieldMembers(type, columnBindingFlags);
for (int i = 0; i < objs.Length; i++)
{
DataRow dr = dt.NewRow();
for (int k = 0; k < columns.Length; k++)
{
if (columns[k].CanRead)
{
dr[columns[k].Name] = columns[k].GetValue(objs[i]);
}
}
dt.Rows.Add(dr);
}
}
/// <summary>
/// 获取具有 <see cref="ColumnAttribute"/> 属性的缺省值
/// </summary>
/// <param name="type">需要反射的类型</param>
/// <returns>缺省值列表</returns>
public static object[] GetDefaultColumnAttibuteValues(Type type)
{
IFieldMemberInfo[] members = FieldMemberInfo.GetFieldMembers(type);
object[] defaultValues = new object[members.Length];
for (int i = 0; i < members.Length; i++)
{
IFieldMemberInfo member = members[i];
Type memberType = member.MemberInfo.DeclaringType;
object defaultValue = member.Column.DefaultValue;
if (defaultValue == null)
{
defaultValues[i] = memberType.TypeInitializer.Invoke(null);
}
else
{
if (memberType == typeof(DateTime))
{
switch (defaultValue.ToString())
{
case "DateTime.Now":
defaultValue = DateTime.Now;
break;
case "DateTime.MinValue":
defaultValue = DateTime.MinValue;
break;
case "DateTime.MaxValue":
defaultValue = DateTime.MaxValue;
break;
}
}
defaultValues[i] = defaultValue;
}
}
return(defaultValues);
}
/// <summary>
/// WebForm数据到实体属性的转换
/// </summary>
/// <param name="form">被转换的WebForm实体（Page的派生类）</param>
/// <param name="entity">实体（不允许空引用），支持<see cref="DataRow"/>、<see cref="IDataParameterCollection"/></param>
/// <example>
/// <code>
/// public class myPage : System.Web.UI.Page
/// {
/// [Column("Title")]
/// protected TextBox txtTitle;
/// [Column("Description")]
/// protected TextBox txtDescription;
///
/// private void btnSubmit_Click(object sender, EventArgs e) {
/// YourEntity entity = new YourEntity();
/// DataTransfer.TransWebFormDataToEntityProperty(this, entity);
/// }
/// }
/// </code>
/// </example>
public static void TransWebFormDataToEntityProperty(object form, object entity)
{
if (form == null || entity == null)
{
return;
}
Type formType = form.GetType();
IFieldMemberInfo[] columns = FieldMemberInfo.GetFieldMembers(formType, BindingFlags.GetField | BindingFlags.GetProperty | BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public, true);
for (int i = 0; i < columns.Length; i++)
{
if (columns[i].CanRead)
{
string stringValue;
object fieldObject = columns[i].GetValue(form);
if (fieldObject is TextBox)
{
stringValue = (fieldObject as TextBox).Text;
}
else if (fieldObject is DropDownList)
{
stringValue = (fieldObject as DropDownList).SelectedValue;
}
else if (fieldObject is Label)
{
stringValue = (fieldObject as Label).Text;
}
else if (fieldObject is HyperLink)
{
stringValue = (fieldObject as HyperLink).Text;
}
else
{
continue;
}
object value = stringValue;
if (columns[i].Column.ColumnType != null)
{
try {
value = Convert.ChangeType(stringValue, columns[i].Column.ColumnType);
} catch {
if (columns[i].Column.DefaultValue != null)
{
value = columns[i].Column.DefaultValue;
}
else
{
continue;
}
}
}
if (entity is DataRow)
{
DataRow dr = (DataRow)entity;
dr[columns[i].Name] = value;
}
else if (entity is IDataParameterCollection)
{
IDataParameterCollection pc = (IDataParameterCollection)entity;
string pname = columns[i].Name.StartsWith("@") ? columns[i].Name : "@" + columns[i].Name;
((IDataParameter)pc[pname]).Value = value;
}
else
{
Type entityType = entity.GetType();
PropertyInfo property = entityType.GetProperty(columns[i].Name, ColumnBindingFlags);
if (property != null && property.CanWrite)
{
property.SetValue(entity, value, null);
}
}
}
}
}
