public static async Task <DataSet> DeserializeStream(Stream stream, CancellationToken cancellationToken, bool leaveStreamOpen = false)
{
var DS = new DataSet();
using (var streamReader = new StreamReader(stream, null, true, -1, leaveStreamOpen))
using (var Reader = new Newtonsoft.Json.JsonTextReader(streamReader))
{
DataTable currentDataTable = null;
while (await Reader.ReadAsync(cancellationToken))
{
if (Reader.Depth == 3 && Reader.TokenType == Newtonsoft.Json.JsonToken.PropertyName && Reader.Value.ToString() == "TableName")
{
await Reader.ReadAsync(cancellationToken);
currentDataTable = new DataTable()
{
TableName = Reader.Value.ToString()
};
DS.Tables.Add(currentDataTable);
await Reader.ReadAsync(cancellationToken);
if (Reader.Depth == 3 && Reader.TokenType == Newtonsoft.Json.JsonToken.PropertyName && Reader.Value.ToString() == "Columns")
{
//Start Columns Array
await Reader.ReadAsync(cancellationToken);
if (Reader.TokenType == Newtonsoft.Json.JsonToken.StartArray)
{
//Create Columns
while (await Reader.ReadAsync(cancellationToken) &&
(Reader.TokenType != Newtonsoft.Json.JsonToken.EndArray) &&
Reader.Depth > 3)
{
if (Reader.TokenType == Newtonsoft.Json.JsonToken.StartArray)
{
continue;
}
if (Reader.TokenType == Newtonsoft.Json.JsonToken.EndArray)
{
continue;
}
if (Reader.TokenType == Newtonsoft.Json.JsonToken.String)
{
//First Parameter is the column Name
var column = new DataColumn()
{
ColumnName = Reader.Value.ToString()
};
//Read Second Parameter which is the Type of Column
await Reader.ReadAsync(cancellationToken);
string sType = Reader.Value.ToString();
column.DataType = Type.GetType(HandleDataColumnType(sType));
currentDataTable.Columns.Add(column);
//End Array
await Reader.ReadAsync(cancellationToken);
}
}
}
}
//End Array Columns
await Reader.ReadAsync(cancellationToken);
if (Reader.Depth == 3 && Reader.TokenType == Newtonsoft.Json.JsonToken.PropertyName && Reader.Value.ToString() == "Rows")
{
//Start Rows Array
await Reader.ReadAsync(cancellationToken);
if (Reader.TokenType == Newtonsoft.Json.JsonToken.StartArray)
{
//Start of Data Array
await Reader.ReadAsync(cancellationToken);
while (Reader.Depth > 3)
{
if (Reader.Depth == 4 && Reader.TokenType == Newtonsoft.Json.JsonToken.StartArray)
{
//New Row
var row = currentDataTable.NewRow();
for (int i = 0; i < currentDataTable.Columns.Count; i++)
{
await Reader.ReadAsync(cancellationToken);
bool bArray = false;
var type = currentDataTable.Columns[i].DataType;
if (type.IsArray)
{
type = type.GetElementType();
bArray = true;
}
else if (type.IsGenericType)
{
var typeInfo = type.GetTypeInfo();
bool implementsGenericIEnumerableOrIsGenericIEnumerable =
typeInfo.ImplementedInterfaces.Any(ti => ti.IsGenericType && ti.GetGenericTypeDefinition() == typeof(IEnumerable <>)) ||
typeInfo.GetGenericTypeDefinition() == typeof(IEnumerable <>);
if (implementsGenericIEnumerableOrIsGenericIEnumerable)
{
type = type.GetGenericArguments()[0];
bArray = true;
}
}
if (bArray)
{
await Reader.ReadAsync(cancellationToken);
while (Reader.Depth > 5)
{
if (Reader.Depth == 5)
{
break;
}
ReadValue(row, currentDataTable.Columns[i], Reader.Value, Reader.TokenType, true);
await Reader.ReadAsync(cancellationToken);
if (Reader.Depth == 5)
{
break;
}
}
}
else
{
ReadValue(row, currentDataTable.Columns[i], Reader.Value, Reader.TokenType, false);
}
}
currentDataTable.Rows.Add(row);
}
await Reader.ReadAsync(cancellationToken);
}
}
}
}
}
}
return(DS);
}
