当没有流打开时，在路径上共享违规

我正在用c#开发一款游戏，其中每个"区域"都会有关于它的数据定期保存在保存文件中。对于测试，"SaveAll"方法在关卡开始时被调用一次。

文件操作代码如下:

using UnityEngine;
using UnityEngine.UI;
using System.Collections;
using System.IO;
public class DistrictSaveData : KeepAwake {
    private string saveDirectoryPath = string.Concat(
        System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments),
        "''My Games''District''Districts");
    private string saveFilePath = string.Concat(
        System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments),
        "''My Games''District''Districts''District-x.dat");
    private StreamReader saveFileReader;
    public void SaveAll() {
        foreach (GameObject gO in GameObject.FindGameObjectsWithTag("District")) {
            District district = gO.GetComponent<District>();
            saveFilePath = string.Concat(
                System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments),
                "''My Games''District''Districts''District-", district.id , ".dat");
            if (!Directory.Exists(saveDirectoryPath)) {
                Directory.CreateDirectory(saveDirectoryPath);
            }
            try {
            File.Delete(saveFilePath);
            } catch {}
            File.Create(saveFilePath);
            File.WriteAllText(saveFilePath, district.SendSaveData());
        }
    }
    public void LoadAll() {
        foreach (GameObject gO in GameObject.FindGameObjectsWithTag("District")) {
            District district = gO.GetComponent<District>();
            saveFilePath = string.Concat(
                System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments),
                "''My Games''District''Districts''District-", district.id , ".dat");
            if(File.Exists(saveFilePath)) {
                OpenFileForReading();
                district.isHQ = bool.Parse(saveFileReader.ReadLine());
                district.controllingFaction = StringToFaction(saveFileReader.ReadLine());
                district.agricultureSpecialisation = StringToAgricultureSpecialisation(saveFileReader.ReadLine());
                district.technologySpecialisation = StringToTechnologySpecialisation(saveFileReader.ReadLine());
                district.militarySpecialisation = StringToMilitarySpecialisation(saveFileReader.ReadLine());
                CloseFileAfterReading();
            } else
                break;
        }
    }
    /// <summary>
    /// Opens the save file for reading.
    /// </summary>
    private void OpenFileForReading() {
        saveFileReader = File.OpenText(saveFilePath);
    }
    /// <summary>
    /// Closes the save file after reading.
    /// </summary>
    private void CloseFileAfterReading() {
        saveFileReader.Close();
    }
    private Faction StringToFaction(string stringToConvert) {
        switch (stringToConvert) {
        case "TheCrimsonLegion":
            return Faction.TheCrimsonLegion;
        case "TheVanguardsOfChaos":
            return Faction.TheVanguardsOfChaos;
        case "TheEmeraldFoxes":
            return Faction.TheEmeraldFoxes;
        case "TheSyndicate":
            return Faction.TheSyndicate;
        case "TheKeepersOfTheTome":
            return Faction.TheKeepersOfTheTome;
        case "TheArchitectsOfThought":
            return Faction.TheArchitectsOfThought;
        default:
            return Faction.None;
        }
    }
    private AgricultureSpecialisation StringToAgricultureSpecialisation(string stringToConvert) {
        switch (stringToConvert) {
        case "Farm":
            return AgricultureSpecialisation.Farm;
        case "Plantation":
            return AgricultureSpecialisation.Plantation;
        case "Biodome":
            return AgricultureSpecialisation.Biodome;
        default:
            return AgricultureSpecialisation.None;
        }
    }
    private TechnologySpecialisation StringToTechnologySpecialisation(string stringToConvert) {
        switch (stringToConvert) {
        case "Laboratory":
            return TechnologySpecialisation.Laboratory;
        case "University":
            return TechnologySpecialisation.University;
        case "GreatTechnologicalInstitution":
            return TechnologySpecialisation.GreatTechnologicalInstitution;
        default:
            return TechnologySpecialisation.None;
        }
    }
    private MilitarySpecialisation StringToMilitarySpecialisation(string stringToConvert) {
        switch (stringToConvert) {
        case "Outpost":
            return MilitarySpecialisation.Outpost;
        case "Barracks":
            return MilitarySpecialisation.Barracks;
        case "Fortress":
            return MilitarySpecialisation.Fortress;
        default:
            return MilitarySpecialisation.None;
        }
    }
}

抛出的异常(多次)为:

IOException: Sharing violation on path C:'users'samdy1'My Documents'My Games'District'Districts'District-0.dat
System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, Boolean anonymous, FileOptions options) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System.IO/FileStream.cs:320)
System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize)
(wrapper remoting-invoke-with-check) System.IO.FileStream:.ctor (string,System.IO.FileMode,System.IO.FileAccess,System.IO.FileShare,int)
System.IO.File.Create (System.String path, Int32 bufferSize) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System.IO/File.cs:135)
System.IO.File.Create (System.String path) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System.IO/File.cs:130)
DistrictSaveData+<SaveAll>c__Iterator3.MoveNext () (at Assets/Scripts/_Core/SaveData/DistrictSaveData.cs:29)

这个异常在SaveAll方法的进程的第28行和第29行抛出。但是，SaveAll方法不使用流，所以我不知道如何保持打开状态。事实上，在关卡的这一点上，阅读流根本没有打开。

我错过了什么明显的东西吗?