c#之带有 Listobject> 的 JSON.NET 的 System.OutOfMemoryException

我正在执行一个过程，我的服务器使用 JSON.Net 生成一个包含 25000 条记录且大小为 85MB 的文件，然后该文件由客户端导入。

客户端下载文件并使用 JSON.Net 进行反序列化。

我的问题是时间和在不同的机器上，反序列化命令给出:

System.OutOfMemoryException

注意:我试过手动使用 GC 没有用。

代码生成错误:

var listAddress = JsonConvert.DeserializeObject<List<address>>(File.ReadAllText(@"c:\Temp\test.json"); 

代码生成JSON文件:

using (StreamWriter file = File.CreateText("C:\\test.json")) 
{ 
    JsonSerializer serializer = new JsonSerializer();                         
    serializer.Serialize(file, listAddress);                         
} 

我的类(class)地址

public class Endereco 
{ 
    public int Codigo { get; set; } 
    public string CGCCPF { get; set; } 
    public char? TipoPessoa { get; set; } 
    public string UF { get; set; } 
    public string SiglaDoRG { get; set; } 
    public string MaeFantasica { get; set; } 
    public string DescEndereco { get; set; } 
    public string Complemento { get; set; } 
    public string Bairro { get; set; } 
    public string CEP { get; set; } 
    public string Pai { get; set; } 
    public string Cidade { get; set; } 
    public string Telefone { get; set; } 
    public string Fax { get; set; } 
    public string Email { get; set; } 
    public string IEouRG { get; set; } 
    public string OrgaoEmissorRG { get; set; } 
    public DateTime? DataNascimento { get; set; } 
    public CampoObservacao Observacao { get; set; } 
    public DateTime? DataRegistro { get; set; } 
    public DateTime? DataUltAlteracao { get; set; } 
    public int? CodigoFuncionario { get; set; } 
    public string Ramal { get; set; } 
    public DateTime? DataDeEmissaoRG { get; set; } 
    public string Alfa1 { get; set; } 
    public string Alfa2 { get; set; } 
    public double? Num1 { get; set; } 
    public double? Num2 { get; set; } 
    public string PontoReferencia { get; set; } 
    public string Celular { get; set; } 
    public string EnderecoWeb { get; set; } 
    public string Conta { get; set; } 
    public string Rasocial { get; set; } 
    public int? NcCodigo { get; set; } 
    public int? NcCodigoC { get; set; } 
    public string CFOP { get; set; } 
    public string Numero { get; set; } 
    public int? CodigoMunicipio { get; set; } 
    public int? CodigoPais { get; set; } 
    public string Suframa { get; set; } 
    public string NumeroNit { get; set; } 
    public string InscricaoMunicipal { get; set; } 
    public string IE { get; set; } 
 
    public bool Ativo 
    { 
        get { return !Observacao["Status"].Equals("I"); } 
        set { Observacao["Status"] = !value ? "I" : String.Empty; } 
    } 
 
    public Endereco() 
    { 
        Observacao = new CampoObservacao(); 
    } 
 
    public char? TipoDeMercado 
    { 
        get { return !String.IsNullOrEmpty(Observacao["Tipo de Mercado"]) ? (char?)Observacao["Tipo de Mercado"][0] : null; } 
        set { Observacao["Tipo de Mercado"] = value.HasValue ? value.ToString() : String.Empty; } 
    } 
 
    public char? EstadoCivil 
    { 
        get { return !String.IsNullOrEmpty(Observacao["EstadoCivil"]) ? (char?)Observacao["EstadoCivil"][0] : null; } 
        set { Observacao["EstadoCivil"] = value.HasValue ? value.ToString() : String.Empty; } 
    } 
 
    public Cliente Cliente { get; set; } 
    public Funcionario Funcionario { get; set; } 
    public Filial Filial { get; set; } 
} 

请您参考如下方法:

我正在尝试上面链接的答案:Deserialize json array stream one item at a time .以下轻微修改可能会满足您的需要。它逐项读取和反序列化 JSON，而不是将整个列表加载到内存中:

public static class JsonConvertExtensions 
{ 
    public static IEnumerable<T> DeserializeEnumerableFile<T>(string filename) 
    { 
        using (var stream = new StreamReader(filename)) 
            foreach (var item in DeserializeEnumerable<T>(stream)) 
                yield return item; 
    } 
 
    public static IEnumerable<T> DeserializeEnumerableString<T>(string json) 
    { 
        using (var sr = new StringReader(json)) 
            foreach (var item in DeserializeEnumerable<T>(sr)) 
                yield return item; 
    } 
 
    public static IEnumerable<T> DeserializeEnumerable<T>(TextReader textReader) 
    { 
        var serializer = JsonSerializer.CreateDefault(); 
 
        using (JsonTextReader reader = new JsonTextReader(textReader)) 
        { 
            while (reader.Read()) 
            { 
                if (reader.TokenType == JsonToken.StartObject) 
                { 
                    // Load each object from the stream and do something with it 
                    yield return serializer.Deserialize<T>(reader); 
                } 
            } 
        } 
    } 
}