/// <summary>
/// 类型转换(精准强大)
/// </summary>
/// <param name="value">值处理</param>
/// <param name="t">类型</param>
/// <returns></returns>
public static object ChangeType(object value, Type t)
{
if (t == null)
{
return(null);
}
if (t.FullName == "System.Type")
{
return((Type)value);
}
string strValue = Convert.ToString(value);
if (t.IsGenericType && t.Name.StartsWith("Nullable"))
{
t = Nullable.GetUnderlyingType(t);
if (strValue == "")
{
return(null);
}
}
if (t.Name == "String")
{
if (value is byte[])
{
return(Convert.ToBase64String((byte[])value));
}
return(strValue);
}
if (t.FullName == "System.Text.StringBuilder")
{
return(value as StringBuilder);
}
if (t.FullName == "System.Text.Encoding")
{
return(value as Encoding);
}
if (strValue == "")
{
return(Activator.CreateInstance(t));
}
else if (t.IsValueType)
{
if (t.Name == "DateTime")
{
switch (strValue.ToLower().TrimEnd(')', '('))
{
case "now":
case "getdate":
case "current_timestamp":
return(DateTime.Now);
}
if (DateTime.Parse(strValue) == DateTime.MinValue)
{
return((DateTime)SqlDateTime.MinValue);
}
return(Convert.ChangeType(value, t));//这里用value，避免丢失毫秒
}
if (t.Name == "Guid")
{
if (strValue == SqlValue.Guid || strValue.StartsWith("newid"))
{
return(Guid.NewGuid());
}
return(new Guid(strValue));
}
else if (t.Name.StartsWith("Int"))
{
switch (strValue.ToLower())
{
case "true":
return(1);
case "false":
return(0);
}
if (strValue.IndexOf('.') > -1)
{
strValue = strValue.Split('.')[0];
}
else if (value.GetType().IsEnum)
{
return((int)value);
}
}
else if (t.Name == "Double" || t.Name == "Single")
{
switch (strValue.ToLower())
{
case "infinity":
case "正无穷大":
return(double.PositiveInfinity);
case "-infinity":
case "负无穷大":
return(double.NegativeInfinity);
}
}
else if (t.Name == "Boolean")
{
switch (strValue.ToLower())
{
case "yes":
case "true":
case "1":
case "on":
case "是":
return(true);
case "no":
case "false":
case "0":
case "":
case "否":
default:
return(false);
}
}
else if (t.IsEnum)
{
return(Enum.Parse(t, strValue, true));
}
return(Convert.ChangeType(strValue, t));
}
else
{
Type valueType = value.GetType();
//if(valueType.IsEnum && t.is)
if (valueType.FullName != t.FullName)
{
switch (ReflectTool.GetSystemType(ref t))
{
case SysType.Custom:
return(MDataRow.CreateFrom(strValue).ToEntity(t));
case SysType.Generic:
if (t.Name.StartsWith("List"))
{
return(MDataTable.CreateFrom(strValue).ToList(t));
}
break;
case SysType.Array:
if (t.Name == "Byte[]")
{
if (valueType.Name == "String")
{
return(Convert.FromBase64String(strValue));
}
using (MemoryStream ms = new MemoryStream())
{
new BinaryFormatter().Serialize(ms, value);
return(ms.ToArray());
}
}
break;
}
}
return(Convert.ChangeType(value, t));
}
}
/// <summary>
/// 类型转换(精准强大)
/// </summary>
/// <param name="value">值处理</param>
/// <param name="t">类型</param>
/// <returns></returns>
public static object ChangeType(object value, Type t)
{
if (t == null)
{
return(null);
}
string strValue = Convert.ToString(value);
if (t.IsEnum)
{
if (strValue != "")
{
if (Enum.IsDefined(t, strValue))
{
return(Enum.Parse(t, strValue));
}
int v = 0;
if (int.TryParse(strValue, out v))
{
object v1 = Enum.Parse(t, strValue);
if (v1.ToString() != strValue)
{
return(v1);
}
}
string[] names = Enum.GetNames(t);
string lower = strValue.ToLower();
foreach (string name in names)
{
if (name.ToLower() == lower)
{
return(Enum.Parse(t, name));
}
}
}
//取第一个值。
string firstKey = Enum.GetName(t, -1);
if (!string.IsNullOrEmpty(firstKey))
{
return(Enum.Parse(t, firstKey));
}
return(Enum.Parse(t, Enum.GetNames(t)[0]));
}
if (value == null)
{
return(null);
}
if (t.FullName == "System.Object")
{
return(value);
}
if (t.FullName == "System.Type")
{
return((Type)value);
}
if (t.FullName == "System.IO.Stream" && value is HttpPostedFile)
{
return(((HttpPostedFile)value).InputStream);
}
if (t.IsGenericType && t.Name.StartsWith("Nullable"))
{
t = Nullable.GetUnderlyingType(t);
if (strValue == "")
{
return(null);
}
}
if (t.Name == "String")
{
if (value is byte[])
{
return(Convert.ToBase64String((byte[])value));
}
return(strValue);
}
if (t.FullName == "System.Text.StringBuilder")
{
return(value as StringBuilder);
}
if (t.FullName == "System.Text.Encoding")
{
return(value as Encoding);
}
if (strValue == "")
{
if (t.Name.EndsWith("[]"))
{
return(null);
}
return(Activator.CreateInstance(t));
}
else if (t.IsValueType)
{
if (t.Name == "DateTime")
{
switch (strValue.ToLower().TrimEnd(')', '('))
{
case "now":
case "getdate":
case "current_timestamp":
return(DateTime.Now);
}
if (DateTime.Parse(strValue) == DateTime.MinValue)
{
return((DateTime)SqlDateTime.MinValue);
}
return(Convert.ChangeType(value, t));//这里用value，避免丢失毫秒
}
else if (t.Name == "Guid")
{
if (strValue == SqlValue.Guid || strValue.StartsWith("newid"))
{
return(Guid.NewGuid());
}
return(new Guid(strValue));
}
else
{
switch (strValue.ToLower())
{
case "yes":
case "true":
case "1":
case "on":
case "是":
if (t.Name == "Boolean")
{
return(true);
}
else
{
strValue = "1";
}
break;
case "no":
case "false":
case "0":
case "":
case "否":
if (t.Name == "Boolean")
{
return(false);
}
else
{
strValue = "0";
}
break;
case "infinity":
case "正无穷大":
if (t.Name == "Double" || t.Name == "Single")
{
return(double.PositiveInfinity);
}
break;
case "-infinity":
case "负无穷大":
if (t.Name == "Double" || t.Name == "Single")
{
return(double.NegativeInfinity);
}
break;
default:
if (t.Name == "Boolean")
{
return(false);
}
break;
}
if (t.Name.StartsWith("Int") || t.Name == "Byte")
{
if (strValue.IndexOf('.') > -1)//11.22
{
strValue = strValue.Split('.')[0];
}
else if (value.GetType().IsEnum)
{
return((int)value);
}
}
}
return(Convert.ChangeType(strValue, t));
}
else
{
Type valueType = value.GetType();
//if(valueType.IsEnum && t.is)
if (valueType.FullName != t.FullName)
{
switch (ReflectTool.GetSystemType(ref t))
{
case SysType.Custom:
return(MDataRow.CreateFrom(strValue).ToEntity(t));
case SysType.Generic:
if (t.Name.StartsWith("List"))
{
return(MDataTable.CreateFrom(strValue).ToList(t));
}
break;
case SysType.Array:
if (t.Name == "Byte[]")
{
if (valueType.Name == "String")
{
return(Convert.FromBase64String(strValue));
}
using (MemoryStream ms = new MemoryStream())
{
new BinaryFormatter().Serialize(ms, value);
return(ms.ToArray());
}
}
break;
}
}
return(Convert.ChangeType(value, t));
}
}
internal static List <T> SplitList <T>(string json, int topN, EscapeOp op)
{
List <T> result = new List <T>();
if (!string.IsNullOrEmpty(json))
{
Type t = typeof(T);
// object entity = Activator.CreateInstance(t);
T entity = Activator.CreateInstance <T>();
bool hasSetValue = false;
List <PropertyInfo> pInfoList = ReflectTool.GetPropertyList(t);
List <FieldInfo> fInfoList = ReflectTool.GetFieldList(t);
//string key = string.Empty;
StringBuilder key = new StringBuilder(32);
StringBuilder value = new StringBuilder();
CharState cs = new CharState(false);
try
{
#region 核心逻辑
char c;
for (int i = 0; i < json.Length; i++)
{
c = json[i];
if (!cs.IsKeyword(c)) //设置关键符号状态。
{
if (cs.jsonStart) //Json进行中。。。
{
if (cs.keyStart > 0)
{
key.Append(c);
}
else if (cs.valueStart > 0)
{
value.Append(c);
}
}
else if (!cs.arrayStart)//json结束，又不是数组，则退出。
{
break;
}
}
else if (cs.childrenStart)//正常字符，值状态下。
{
int temp;
int length = GetValueLength(false, json, i, false, out temp);//优化后，速度快了10倍
value.Length = 0;
value.Append(json.Substring(i, length));
cs.childrenStart = false;
cs.valueStart = 0;
cs.setDicValue = true;
i = i + length - 1;
}
if (cs.setDicValue)//设置键值对。
{
if (key.Length > 0)
{
string k = key.ToString();
string val = value.ToString();//.TrimEnd('\r', '\n', '\t');
bool isNull = json[i - 5] == ':' && json[i] != '"' && val.Length == 4 && val == "null";
if (isNull)
{
val = "";
}
else
{
val = JsonHelper.UnEscape(val, op);
}
object o = val;
foreach (PropertyInfo p in pInfoList)
{
if (String.Compare(p.Name, k, StringComparison.OrdinalIgnoreCase) == 0)
{
if (p.CanWrite)
{
if (p.PropertyType.Name != "String")
{
o = ConvertTool.ChangeType(val, p.PropertyType);
}
p.SetValue(entity, o, null);
hasSetValue = true;
}
break;
}
}
if (!hasSetValue && fInfoList.Count > 0)
{
foreach (FieldInfo f in fInfoList)
{
if (String.Compare(f.Name, k, StringComparison.OrdinalIgnoreCase) == 0)
{
if (f.FieldType.Name != "String")
{
o = ConvertTool.ChangeType(val, f.FieldType);
}
f.SetValue(entity, o);
hasSetValue = true;
break;
}
}
}
}
cs.setDicValue = false;
key.Length = 0;
value.Length = 0;
}
if (!cs.jsonStart && hasSetValue)
{
result.Add(entity);
if (topN > 0 && result.Count >= topN)
{
return(result);
}
if (cs.arrayStart)//处理数组。
{
entity = Activator.CreateInstance <T>();
hasSetValue = false;
}
}
}
#endregion
}
catch (Exception err)
{
Log.Write(err, LogType.Error);
}
finally
{
key = null;
value = null;
}
}
return(result);
}
/// <summary>
/// DbDataReader To List
/// </summary>
internal static List <T> ChangeReaderToList <T>(DbDataReader reader)
{
Type t = typeof(T);
List <T> list = new List <T>();
if (t.Name == "MDataRow")
{
MDataTable dt = reader;
foreach (object row in dt.Rows)
{
list.Add((T)row);
}
}
else if (reader != null)
{
#region Reader
if (reader.HasRows)
{
Dictionary <string, Type> kv = new Dictionary <string, Type>(StringComparer.OrdinalIgnoreCase);
for (int i = 0; i < reader.FieldCount; i++)
{
kv.Add(reader.GetName(i), reader.GetFieldType(i));
}
List <PropertyInfo> pInfoList = ReflectTool.GetPropertyList(t);
List <FieldInfo> fInfoList = ReflectTool.GetFieldList(t);
while (reader.Read())
{
T obj = Activator.CreateInstance <T>();
if (pInfoList.Count > 0)
{
foreach (PropertyInfo p in pInfoList)//遍历实体
{
if (p.CanWrite && kv.ContainsKey(p.Name))
{
object objValue = reader[p.Name];
if (objValue != null && objValue != DBNull.Value)
{
if (p.PropertyType != kv[p.Name])
{
objValue = ChangeType(objValue, p.PropertyType);//尽量避免类型转换
}
p.SetValue(obj, objValue, null);
}
}
}
}
if (fInfoList.Count > 0)
{
foreach (FieldInfo f in fInfoList)//遍历实体
{
if (kv.ContainsKey(f.Name))
{
object objValue = reader[f.Name];
if (objValue != null && objValue != DBNull.Value)
{
if (f.FieldType != kv[f.Name])
{
objValue = ChangeType(objValue, f.FieldType);//尽量避免类型转换
}
f.SetValue(obj, objValue);
}
}
}
}
list.Add(obj);
}
kv.Clear();
kv = null;
}
reader.Close();
reader.Dispose();
reader = null;
#endregion
}
return(list);
//return List<default(T)>;
}
/// <summary>
/// 类型转换(精准强大)
/// </summary>
/// <param name="value">值处理</param>
/// <param name="t">类型</param>
/// <returns></returns>
public static object ChangeType(object value, Type t)
{
if (t == null)
{
return(null);
}
if (t.FullName == "System.Type")
{
return((Type)value);
}
string strValue = Convert.ToString(value);
if (t.IsGenericType && t.Name.StartsWith("Nullable"))
{
t = Nullable.GetUnderlyingType(t);
if (strValue == "")
{
return(null);
}
}
if (t.Name == "String")
{
return(strValue);
}
if (t.FullName == "System.Text.StringBuilder")
{
return(value as StringBuilder);
}
if (t.FullName == "System.Text.Encoding")
{
return(value as Encoding);
}
if (strValue == "")
{
return(Activator.CreateInstance(t));
}
else if (t.IsValueType)
{
if (t.Name == "DateTime")
{
return(Convert.ChangeType(value, t));//这里用value，避免丢失毫秒
}
if (t.Name == "Guid")
{
return(new Guid(strValue));
}
else if (t.Name.StartsWith("Int"))
{
if (strValue.IndexOf('.') > -1)
{
strValue = strValue.Split('.')[0];
}
else if (value.GetType().IsEnum)
{
return((int)value);
}
}
else if (t.Name == "Boolean")
{
switch (strValue.ToLower())
{
case "yes":
case "true":
case "1":
case "on":
case "是":
return(true);
case "no":
case "false":
case "0":
case "":
case "否":
default:
return(false);
}
}
else if (t.IsEnum)
{
return(Enum.Parse(t, strValue, true));
}
return(Convert.ChangeType(strValue, t));
}
else
{
//Type valueType = value.GetType();
//if(valueType.IsEnum && t.is)
if (value.GetType().FullName != t.FullName)
{
switch (ReflectTool.GetSystemType(ref t))
{
case SysType.Custom:
return(MDataRow.CreateFrom(strValue).ToEntity(t));
case SysType.Generic:
if (t.Name.StartsWith("List"))
{
return(MDataTable.CreateFrom(strValue).ToList(t));
}
break;
case SysType.Array:
if (t.Name == "Byte[]" && value.GetType().Name != t.Name)
{
using (MemoryStream ms = new MemoryStream())
{
new BinaryFormatter().Serialize(ms, value);
return(ms.ToArray());
}
}
break;
}
}
return(Convert.ChangeType(value, t));
}
}