c# - Value was either too large or too small for a UInt64 while deserializing data -

i posting json string method , getting error while deserializing class.

error:

error converting value -1 type 'system.nullable`1[system.uint64]'. path 'mymappings1.mysqlcolumns[7].size'. inner exception : {"value either large or small uint64."}

below class in want output after deserializing json value :

public class mymappings    {        public string name { get; set; }        public list<mysqlcolumns> mysqlcolumns { get; set; }    }  public class mysqlcolumns     {         public string column { get; set; }         public string datatype { get; set; }         public string isnullable { get; set; }         public uint64? size { get; set; }         public uint64? numericprecision { get; set; }         public uint64? numericscale { get; set; }     }  string myjson =  "mymappings": [     {       "name": "dbo.table1",       "mysqlcolumns": [         {           "name": "address",           "datatype": "nvarchar",           "isnullable": "yes",           "size": -1,           "numericprecision": null,           "numericscale": null         }]  var deserializedata = jsonconvert.deserializeobject<mymappings>(myjson); 

now when user set nvarchar(max) columns set size -1 setinel value represent max size.now reason setting size -1 because while reading column size nvarchar(max) setinel value -1 per marc gravell comment

i have seen answer question how use while deserialization.i using newtonsoft json

update:reason specifying size uint:

can please me this??

the u in types names stands unsigned values positive. value -1 small stored in such variable. either change type signed int64. or use null marker max , interpret accordingly while creating column.

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as update thing can use null , make logic interpret -1 when needed. sad can't have cake , eat @ same time.